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NOVA Health Recovery | Alexandria, Va 22306 | Call for esketamine and nasal ketamine as well as IV Ketamine for depression, PTSD, anxiety  703-844-0184 < Link

Call NOVA Health Recovery at 703-844-0184 for a free consultation for a Ketamine infusion. No referral needed. We offer intranasal Ketamine follow up therapy as well. Alexandria, Va 22306.

Call NOVA Health Recovery at 703-844-0184 for a free consultation for a Ketamine infusion. No referral needed. We offer intranasal Ketamine follow up therapy as well. Alexandria, Va 22306.

From Popular Anesthetic to Antidepressant, Ketamine Isn’t the Drug You Think It Is

An hour before we spoke, Darragh O’Carroll, an emergency room physician from Hawaii, had just given an elderly patient a sedating shot of ketamine. The man had pneumonia and was acting confused and fidgety, making him hard to treat.

“Not only it was a pain control for him when I was putting needles into his neck, but it also kept him still,” O’Carroll says. “And with very minimal risk of lowering his blood pressure.”

Ketamine’s use as an anesthetic — and not as a party drug — is widespread, though not commonly known. In fact, the World Health Organizationestimates ketamine is the most widely used anesthetic in the world and keeps it on their list of essential medicines, a category of drugs that all developed countries should have on hand.

O’Carroll has described ketamine as his “favorite medicine of all time” in an article for Tonic, not only because the anesthetic is incredibly safe and effective, but also because of its versatility. It’s most widely used in surgery, but could also help treat severe asthma, chronic pain, and may even possess anti-tumor properties. In the last two decades, ketamine has also emerged as a potent antidepressant, able to treat symptoms of some mental illnesses in less than 72 hours.

“I think the more research that goes into ketamine, the more uses that we find for it,” O’Carroll says.

From PCP to Painkiller

Ketamine’s story begins with a drug called PCP. Yes, that PCP — phencyclidine or so-called “angel dust,” a drug that when smoked can cause a trance-like state, agitation and out-of-body hallucinations. After it was first synthesized by medicinal chemist Victor Maddox in 1956, the drug was briefly approved as an anesthetic by the FDA for its sedative properties. In tests with a wild rhesus monkey, for example, researchers put their fingers in the previously aggressive animal’s mouth and watched its jaw remain slack.

But while it was safe and effective for pain relief, the side effects of PCP soon became too obvious to ignore.

Some patients under the influence of PCP would feel like they lost their arms or legs or that they were floating in space. It could also cause seizures and delirium. Scientists began seeking a shorter-acting anesthetic without convulsant properties. In 1962, chemistry professor Calvin Stevens discovered a PCP analogue that fit the bill: ketamine.

Ketamine is a potent, sedating painkiller that can cause amnesia and is mostly used in surgery and veterinary medicine. During the Vietnam Invasion, ketamine saw widespread use in the U.S. military because it has several advantages over opioids. First, unlike morphine, ketamine doesn’t suppress blood pressure or breathing. It also doesn’t need to be refrigerated, making it useful in the field or in rural areas that don’t have access to electricity.

Ketamine’s benefits extend beyond use as an anesthetic, though — in some cases it can serve as a balm for the mind as well. A 2008 analysis found that burn victims who were given ketamine were less likely to develop symptoms of post-traumatic stress disorder, even if their injuries were more severe. Those findings have been replicated, such as a 2014 clinical trial of 41 patients, who saw their PTSD symptoms diminish within 24 hours, an effect that lasted for two weeks.

“When somebody gets one of their limbs dramatically blown off or is shot in the face, it’s a very traumatic event,” O’Carroll says. In such a situation, giving ketamine not only provides instant pain relief, it could prevent long-lasting trauma.

Because its chemical structure is so similar to PCP, ketamine can still give lucid hallucinations, such as feeling that your mind has separated from the body — a dissociative state users sometimes call a “K-hole.” One recent study based on users’ written reports even indicated that this kind of experience might be a close analogue to a near-death experience. However, these dissociative states only happen at high doses — the amount of ketamine used to for surgery and to treat depression is typically much lower.

But ketamine’s side effects are less common and easier to manage than PCP. In fact, ketamine is one of the safest drugs used in medicine today and can even be given to young children. For example, ketamine was used to sedatethe boys’ soccer team trapped in a cave in Thailand last year. Putting the kids in a tranquilized state made it easier to rescue them, and ketamine is safer than the opioids or benzodiazepines that are also commonly used as sedatives.  

Ketamine as Antidepressant

But it wasn’t until the 1990s that what could turn out to be ketamine’s most important function was discovered. A team from Yale University School of Medicine was examining the role of glutamate, a common neurotransmitter, in depression, and discovered something remarkable: ketamine could rapidly relieve depression symptoms.

“To our surprise, the patients started saying, they were better in a few hours,” Dennis Charney, one of the researchers, told Bloomberg. This rapid relief was unheard of in psychiatry.

Glutamate is associated with neural plasticity, our brain’s ability to adapt and change at the level of the neuron. Ketamine blocks certain glutamate receptors, but not others, and the end effect could be to promote the growth of new neurons while protecting old ones. This could explain how ketamine can help reset the brain, though the theory hasn’t yet been definitively proven.

The prescription meds currently on the market for depression have some major drawbacks. Drugs like Prozac or Wellbutrin can take a few weeks or months to kick in while worsening symptoms in the short term — not a good combination, especially for someone who is extremely depressed, or even suicidal.

It took around a decade for mainstream science to take notice of these early ketamine-depression studies. But once it did, ketamine clinics began popping up all across North America, offering fast relief for depression, anxiety and other mental illnesses. Patients are given an infusion — an IV drip that lasts about an hour — and many people, but not everyone, have seen rapid relief of their symptoms.

Suddenly, ketamine infusions became trendy, though the science to back up some of the medical claims is still inconclusive, according to STAT. However, ketamine infusions are rarely covered by insurance, although that is changing. A typical session can run $700, with many patients taking six sessions or more. But many of these patients have so-called treatment-resistant depression. They’ve tried other medications or therapies without success and some see ketamine as a last resort.

Steven Mandel, a clinical psychologist and anesthesiologist, has used ketamine on patients since it first came on the market around 50 years ago. In 2014, he began using it for patients with depression and opened Ketamine Clinics of Los Angeles, one of the oldest and largest clinics in the country. They’ve done over 8,000 infusions so far.

“Our success rate is better than 83 percent,” Mandel says. For his clinic, success means a 50 percent improvement of depression symptoms for longer than three months.

Ketamine’s success as an antidepressant couldn’t help but attract the attention of major pharmaceutical companies as well. In 2009, Johnson & Johnson began developing their own version of the drug they called esketamine. Rather than an infusion through a vein, it’s dispensed through a nasal spray. The FDA approved their formulation in early March. It was thefirst drug in 35 years to fight depression using a different approach than traditional drugs.

“Esketamine is a giant step forward,” Mandel says. “It means we’re not going to be demonizing mind-altering substances used for therapeutic purposes. It opens the door to research on LSD, on psilocybin, on MDMA and many other agents that could possibly relieve a great deal of suffering.”

But many clinicians have raised concerns about long-term side effects, such as heart and bladder toxicity. Others have been critical of esketamine, saying there isn’t enough data yet to suggest the drug is safe or effective. Husseini Manji, a neuroscientist who helped develop the drug for Johnson & Johnson at their subsidiary Janssen, has pushed back against these claims.

“When you line up the totality of the studies, it was really an overwhelming amount of data that was all in the same direction,” Manji says in a call. Though just two of the five late-state clinical trials showed significant results, the changes in mood in the three that fell short were “almost identical in magnitude” to the others, Manji says. It was enough for the drug to meet standards for FDA approval.

We can probably expect other ketamine-related drugs to come to market soon. ATAI Life Sciences, a company funding research on the use of magic mushrooms for depression, is developing their own ketamine depression drug. The pharmaceutical company Allergan also developed rapastinel, another ketamine-like drug, though it failed to show any real benefits for patients in later trials. Manji says this is unfortunate for people who could be helped by these kinds of drugs.

“From a patient standpoint, we were hoping it would work,” he says, even though he was not involved in rapastinel’s development. “But sometimes if you really haven’t got the mechanism right and you haven’t really threaded the needle, then sometimes you don’t see these results.”

Drug of Abuse?

Even though ketamine’s medical uses are well-established, most people have only heard of ketamine in the context of a party drug. Because of this bad reputation — and what’s perceived as growing misuse of the drug — several countries, such as China and the UK, have tried to place greater restrictions on ketamine. This would make it harder to study and more expensive in clinical use.

“If it was to ever be rescheduled, places that would be first affected would be you know places that need it most,” O’Carroll says. The WHO has asked at least four times for countries to keep access to ketamine open. “The medical benefits of ketamine far outweigh potential harm from recreational use,” Marie-Paule Kieny, assistant director general for Health Systems and Innovation at WHO, said in 2015.

So far, no countries have put greater restrictions on ketamine, and that’s probably a good thing. Ketamine has a rich history, but its future is still being written.



KETAMINE CENTER NORTHERN VIRGINIA | 703-844-0184 | NOVA HEALTH RECOVERY | SPRAVATO KETAMINE NASAL SPRAY CENTER |ALEXANDRIA, VA 22306 | KETAMINE FOR DEPRESSION AND PTSD | 22304 |20176 | 703-844-0184 | 22101 | 22102 | FAIRFAX KETAMINE INFUSION CENTER 22304 | DR. SENDI | Ketamine and OCD, PTSD, Depression, Anxiety



Call NOVA Health Recovery at 703-844-0184 for a free consultation for a Ketamine infusion. No referral needed. We offer intranasal Ketamine follow up therapy as well. Alexandria, Va 22306.

Call NOVA Health Recovery at 703-844-0184 for a free consultation for a Ketamine infusion. No referral needed. We offer intranasal Ketamine follow up therapy as well. Alexandria, Va 22306.

Ketamine: A Promising Novel Therapy for Anxiety and PTSD

Ketamine was originally approved by the US Food and Drug Administration (FDA) as an anesthetic, but is increasingly being used to treat mood disorders, such as treatment-resistant depression, anxiety disorders, and post-traumatic stress disorder (PTSD).1,2 Several studies have also found it to be effective for treating suicidal ideation.3,4

“Ketamine can play an important role in the treatment of anxiety disorders,” according to Prakash Masand, MD, co-founder, chairman, and CEO of Centers of Psychiatric Excellence (COPE) (https://www.copepsychiatry.com) and adjunct professor at the Academic Medicine Education Institute, Duke-National University of Singapore Medical School (Duke-NUS).

“Nowadays, people with anxiety disorders are treated either with a generic antidepressant, such as an SSRI (selective serotonin reuptake inhibitor), an SNRI (selective norepinephrine reuptake inhibitor), or a benzodiazepine and if they don’t respond to one of these, they get a trial of another or several more,” Dr Masand said.

However, between 30% and 40% of these patients will not achieve remission, despite 3 or 4 different traditional agents, and even with evidence-based nonpharmacologic therapies, such as cognitive behavioral therapy (CBT) or mentalization-based therapy (MBT), he noted.

“No good current strategies are available for these non-responders, so novel agents are being studied — including ketamine, which is accumulating an evidence base as [being] rapidly effective for an array of anxiety disorders, including social anxiety disorder (SAD) and PTSD,” he said.

How Does Ketamine Work?

A growing body of evidence points to the role of glutamate, a widely distributed excitatory neurotransmitter, in mediating response to stress and the formation of traumatic memories.2 Ketamine is an ionotropic glutamatergic N-methyl-d-aspartate (NMDA) receptor antagonist. Its antidepressant and anti-anxiety effects are presumed to occur through activating synaptic plasticity by increasing brain-derived neutrophic factor translation and secretion and also by inhibiting glycogen synthase kinase-3 and activating mammalian target of rapamycin signaling.5

Brain-derived neutrophic factor plays a role in behavioral responses to classical antidepressants, but the impact on synaptic plasticity may take several weeks to manifest. In contrast, ketamine-mediated synaptic plasticity changes appear to occur within a matter of hours after ketamine administration.5

“The current thinking is that eventually, 6 to 12 weeks after initiating treatment with traditional antidepressants, dendritic growth and increased synaptic connections occur but with ketamine, these can occur within 24 hours of the infusion,” Dr Masand said.

Ketamine and Anxiety: An Increasing Evidence Base

“Ketamine has been studied and shown [to be] effective with an array of anxiety disorders, including SAD, general anxiety disorder (GAD), and PTSD, although the data on its effectiveness in obsessive compulsive disorder (OCD) are more mixed,” Dr Masand observed.

GAD/SAD

  • A small study of patients with GAD and/or SAD (n=12) compared 3 ascending ketamine doses to midazolam. Each was given at 1-week intervals, with midazolam counterbalanced in dosing position across patients. Ketamine was found to dose-dependently improve scores on the Fear Questionnaire. Moreover, it’s impact on decreasing theta frequency in the right frontal sites assessed via  electroencelphalogram (EEG) was comparable to that of conventional anxiolytics.6
  • Glue et al evaluated the efficacy and safety of ketamine in 12 patients with refractory GAD and/or SAD who were not currently depressed using an ascending single-dose at weekly intervals study design. Within 1 hour of dosing, patients reported reduced anxiety, which persisted for up to 7 days.7
  • A continuation of that study evaluated the impact of maintenance treatment ketamine in patients with GAD and/or SAD (n=20) and found that 18 of the 20 patients reported ongoing improvements in social functioning and/or work functioning during maintenance treatment. The researchers concluded that maintenance therapy ”may be a therapeutic alternative for patients with treatment-refractory GAD/SAD.”8

“What is interesting about this study is that the impact of just one infusion lasted for 14 weeks, suggesting that patient[s] with anxiety disorders might have longer maintenance of response than patients with major depression, where the response has been maintained for only one week,” Dr Masand commented.

Anxious Depression

  • A study of patients with anxious and non-anxious bipolar depression (n=21 for both groups) found that both anxious and non-anxious patients with bipolar depression had significant antidepressant responses to ketamine, although the anxious depressed group did not show a clear antidepressant response disadvantage over the non-anxious group.9 “Given that anxiety has been shown to be a predictor of poor treatment response in bipolar depression when traditional treatments are used, our findings suggest the need for further investigations into ketamine’s novel role in the treatment of anxious bipolar depression.,” the investigators concluded.9

Related Articles

OCD

  • An open-label trial of ketamine in 10 patients with treatment-refractory OCD found that ketamine’s effects on OCD symptoms, in contrast to depressive symptoms, did not seem to persist or progress after the acute effects of ketamine had dissipated.10
  • On the other hand, another randomized controlled trial (RCT) of 15 patients with OCD found that anti-OCD effects from a single intravenous dose of ketamine persisted for more than 1 week in some patients with OCD with constant intrusive thoughts, demonstrating that “a drug affecting glutamate neurotransmission can reduce OCD symptoms without the presence of an [SSRI].”11

PTSD

In PTSD, there is “mounting evidence for a role of the excitatory neurotransmitter glutamate in stress responsiveness, the formation of traumatic memories, and the pathophysiology of PTSD, raising the possibility of identifying novel glutamatergic interventions for this disorder.”12

  • One double-blind study demonstrated that infusion of ketamine rapidly and significantly reduces symptom severity in patients with  PTSD compared with midazolam.2
  • Another study found that administration of ketamine immediately after witnessing a traumatic event has been shown to prevent the enhancement of passive avoidance learning in mice.13Ketamine may thus target the mechanisms involved in the consolidation of traumatic memory and may enable the brain to reconsolidate memory and release trauma.14
  • A case study of a child with PTSD reported remission from behavioral dysregulation after receiving procedural ketamine.15

Drawbacks and Potential Adverse Effects

The main concern regarding the use of ketamine for anxiety disorders is the lack of a road map regarding maintenance, Dr Masand noted.

“At COPE, we have found that roughly 30% to 40% of our patients being treated with ketamine require maintenance infusions, and we highly personalize this approach so that patients can identify early signs of recurrence or relapse and we can devise a treatment schedule to prevent them,” he said.

Some patients continue treatment with pharmacotherapy, including standard antidepressants, benzodiazepines, or a mood stabilizer such as valproate and some patients become more receptive to psychotherapies such as CBT,” he stated.

However, “there is very little data regarding what happens long-term in this patient population.”

“Most side effects are mild and transient,” Dr Masand reported. “Patients must be monitored because of potential increases in blood pressure and pulse.”

Additional adverse events include nausea or vomiting, which are also mild and transient. Patients may be pre-treated with prophylactic anti-nausea medication, such as ondansetron, to pre-empt these symptoms, he said.

Some patients experience dissociation, or an out-of-body experience, which is also usually transient but seen by some patients as “annoying,” he noted. “Dissociative experiences are sometimes seen as a biomarker for insufficient response and suggest that the dose should be increased.”

Providers should be aware that cystitis and lower urinary tract pathologies (eg, detrusor over-activity) have been reported in long-term ketamine users, but typically only at high doses.16

Ketamine’s psychedelic effects make it a” popular recreational drug.”16 At lower doses, the predominant effects are stimulating, and users experience mild dissociation with hallucinations and a distortion of time and space. However, higher doses can induce more severe, schizophrenia-like symptoms and perceptions.16 Although these effects resolve rapidly, long-term use “can cause more pronounced and persistent neuropsychiatric symptoms. For this reason, ketamine should be “used cautiously with other drugs that alter mood and perception, including alcohol, opioids, benzodiazepines and cannabis.”16

Promising Role

“Ketamine for treatment-resistant depression has a robust evidence base and a rapidly-growing evidence base for its use in anxiety disorders,” Dr Masand said.

“Given the gaps in current treatment, this promising agent is occupying a more promising role in treatment of anxiety disorders, such as PTSD. Considering how common PTSD is, ketamine can make an important difference for a large number of people who suffer from this debilitating condition,” he concluded.

First Person Account of Ketamine Therapy: An Interview with Kimberly Palmer

To gain insight into the experience of ketamine treatment in a person with depression and anxiety, Psychiatry Advisor interviewed Kimberly Palmer of Los Angeles, California. Ms Palmer received treatment at the Ketamine Clinics of Los Angeles (https://www.ketamineclinics.com). Ms Palmer works as a program manager for a consulting company where she organizes and runs corporate events for small groups.

Psychiatry Advisor: What made you decide to pursue ketamine treatment?

Ms Palmer: I was raised in an abusive home, and as an adult I had severe major depression, as well as anxiety. I was treated with medications, such as antidepressants, but they had many adverse events and they ended up making me feel like a zombie, so I discontinued them. I managed okay for a while, but then I had another major depressive episode.

I was receiving psychotherapy at the time and it was only moderately helpful — not enough to stop the episode. Fortunately, I knew someone who works at a ketamine clinic. She told me how many patients had been helped by ketamine and I was interested, mostly because the adverse events of ketamine seemed mild and are not long-term.

Psychiatry Advisor: What were your experiences during your infusion?

Ms Palmer: I felt incredible during the infusion. The best way I can describe it is by referring to the movie Avatar, specifically the scene in which the protagonist is walking through a jungle at night for the first time and touching all the plants, which light up with pretty colors—very vivid, colorful, and not linear. There was the sensation of being on a sort of roller coaster, riding through different scenes.

At one point, it felt as though my chair was on a cloud. Then suddenly, the chair disappeared and I was floating on the cloud. It was a wonderful experience.

Psychiatry Advisor: How did the ketamine treatment affect you afterwards?

Ms Palmer: After only one treatment, it was as if a switch had flipped in my brain that allowed me to digest things and move beyond my trauma. Before the infusion, a lot of what was going on with me had to do with self-esteem issues and negative self-talk. These were behaviors learned over many years. After the infusion, the negative self-talk immediately disappeared. All of those thoughts — such as telling myself I am not good enough — that were preventing me from working through emotional issues, were resolved. I was able to start looking at things more objectively rather than taking them personally, and not take on responsibility for other people’s emotions and reactions.

I am currently working with a therapist and a life coach to help me feel more comfortable with communication because I was raised not to ask for things and to put up with anything I’m asked to do. As a result, I have developed a much more positive outlook of myself and the world.

Psychiatry Advisor: How many ketamine treatments have you had?

Ms Palmer: Over a 6-month period I had 6 treatments, which were all very helpful. Then, 6 months after the conclusion of this first series of treatments, some new issues came up, so I received 2 more — one regular 60-minute treatment and one extended 90-minute treatment.

Recently, with the holidays coming up, I decided to pre-empt the effect of some stressors and have another treatment. My most recent infusion took place the day after my father passed away. I noticed that during the infusion, I was able to steer myself away from negative thoughts about that issue. Although I cannot control what visions or experiences I might have, I do have some control over the direction of my thoughts and the after-effects have been positive and helpful.

Psychiatry Advisor: Did you have any adverse events from the treatments?

Ms Palmer: I had no negative physical effects. I had one mild bad reaction, when I came to the treatment session in an agitated state because I had gotten into a fight with someone right before. I was sad and crying  by the time I finished the infusion. But I was in a bad headspace before I even walked into the room. And my experience was not scary, only sad.

Psychiatry Advisor: What impact has your treatment had on your day-to-day life?

Ms Palmer: My depression had interrupted my schooling. I was in school for 3 and a half years and then I hit a roadblock. After the treatments, I was able to complete my studies and graduated with a BA in business administration and management.

My job is stressful. I counterbalance the stress with hobbies like surfing and photography. But there are still stressors, and I have a dog who is reaching the end of life, which is affecting me. The ketamine treatments have helped me to manage those stressors. 

References

  1. Sanacora G, Frye MA, McDonald W, et al. A consensus statement on the use of ketamine in the treatment of mood disordersJAMA Psychiatry. 2017;74(4):399-405.
  2. Feder A, Parides M, Murrough JW, et al. Efficacy of intravenous ketamine for treatment of chronic posttraumatic stress disorder: a randomized clinical trialJAMA Psychiatry. 2014;71(6):681-688.
  3. Murrough JW, Soleimani L, DeWilde KE, et al. Ketamine for rapid reduction of suicidal ideation: a randomized controlled trialPsychol Med. 2015;45(16):3571-3580.
  4. Wilkinson ST, Ballard ED, Bloch MH, et al. The effect of a single dose of intravenous ketamine on suicidal ideation: a systematic review and individual participant data meta-analysisAm J Psychiatry. 2018;175(2):150-158.
  5. Schwartz J, Murrough JW, Iosifescu DV. Ketamine for treatment-resistant depression: recent developments and clinical applicationsEvid Based Ment Health. 2016;19(2):35-38.
  6. Shadli SM, Kawe T, Martin D, McNaughton N, Neehoff S, Glue P. Ketamine effects on EEG during therapy of treatment-resistant generalized anxiety and social anxiety [published online April 24,2018]. Int J Neuropsychopharmacology. doi:10.1093/ijnp/pyy032
  7. Glue P, Medlicott NJ, Harland S, et al. Ketamine’s dose-related effects on anxiety symptoms in patients with treatment refractory anxiety disorders. J Psychopharmacol. 2017;31(10):1302-1305.
  8. Glue P, Neehoff SM, Medlicott NJ, Gray A, Kibby G, McNaughton N. Safety and efficacy of maintenance ketamine treatment in patients with treatment-refractory generalised anxiety and social anxiety disordersJ Psychopharmacol. 2018;32(6):663-667.
  9. Ionescu DF, Luckenbaugh DA, Niciu MJ, Richards EM, Zarate CA. A single infusion of ketamine improves depression scores in patients with anxious bipolar depressionBipolar Disord. 2014;17(4):438-443.
  10. Bloch MH, Wasylink S, Landeros-Weisenberger A, et al. Effects of ketamine in treatment-refractory obsessive-compulsive disorderBiol Psychiatry. 2012;72(11):964-970.
  11. Rodriguez CI, Kegeles LS, Levinson A, et al. Randomized controlled crossover trial of ketamine in obsessive-compulsive disorder: proof-of-concept. Neuropsychopharmacology. 2013;38(12):2475-2483.
  12. Girgenti MJ, Ghosal S, LoPresto D, Taylor JR, Duman RS. Ketamine accelerates fear extinction via mTORC1 signalingNeurobiol Dis. 2016;100:1-8.
  13. Ito W, Erisir A, Morozov AObservation of distressed conspecific as a model of emotional trauma generates silent synapses in the prefrontal-amygdala pathway and enhances fear learning, but ketamine abolishes those effects. Neuropsychopharmacology. 2015; 40(11):2536-2545.
  14. Fattore L, Piva A, Zanda MT, Fumagalli G, Chiamulera C. Psychedelics and reconsolidation of traumatic and appetitive maladaptive memories: focus on cannabinoids and ketaminePsychopharmacology (Berl). 2018;235(2):433-445.
  15. Donoghue AC, Roback MG, Cullen KR. Remission from behavioral dysregulation in a child with PTSD after receiving procedural ketaminePediatrics. 2015;136(3):e694-e696.
  16. Li L, Vlisides PE. Ketamine: 50 years of modulating the mindFront Hum Neurosci. 2016;10:612.

Recommended For You



Ketamine Center Northern Virginia | 703-844-0184 | NOVA Health Recovery | Spravato Ketamine nasal spray Center |Alexandria, Va 22306 | Ketamine for depression and PTSD | 22304 |20176 | 703-844-0184 | 22101



Call NOVA Health Recovery at 703-844-0184 for a free consultation for a Ketamine infusion. No referral needed. We offer intranasal Ketamine follow up therapy as well. Alexandria, Va 22306.

Call NOVA Health Recovery at 703-844-0184 for a free consultation for a Ketamine infusion. No referral needed. We offer intranasal Ketamine follow up therapy as well. Alexandria, Va 22306.

VA to offer new ketamine-based nasal spray to help combat depression

The newest FDA-approved medication to treat severe depression, a nasal spray based on the anesthetic (and misused hallucinogenic party drug) ketamine, will soon be available to veterans treated within the Department of Veterans Affairs.

In a move that may help thousands of former service members with depression that has not improved with other treatments, VA officials announced Tuesday that the department’s doctors are now authorized to prescribe Spravato, the brand name for esketamine, a molecular variation of ketamine.

The decision to offer a drug hailed by many as a breakthrough in treatment for its speedy results — often relieving symptoms in hours and days, not weeks — shows the VA’s “commitment to seek new ways to provide the best health care available for our nation’s veterans,” Secretary Robert Wilkie said in a release.

“We’re pleased to be able to expand options for Veterans with depression who have not responded to other treatments,” Wilkie added.

The treatment will be available to veterans based on a physician’s assessment and only will be administered to patients who have tried at least two antidepressant medications and continue to have symptoms of major depressive disorder.

An estimated 16 million Americans have had at least one major episode of depression, and of those, 1 in 3 are considered treatment-resistant. In the veteran population of 20 million, the estimated diagnosis rate of depression is 14 percent — up to 2.8 million veterans. Between one-third and half of those veterans may be treatment-resistant.

The lack of effective medications for difficult-to-treat patients prompted the Food and Drug Administration to place esketamine on a fast track, expediting its review of the drug to ensure that it went to patent as soon as safely possible, according to administration officials.

“Controlled clinical trials that studied the safety and efficacy of this drug, along with careful review through the FDA’s drug approval process, including a robust discussion with our external advisory committees, were important in our decision to approve this treatment,” said Dr. Tiffany Farchione, acting director of the FDA’s Center for Drug Evaluation and Research Division of Psychiatry Products, in a release.

As with any other medication, there are risks. Spravato carries a boxed warning for side effects that include misuse, the reason it is administered under a doctor’s supervision. The list of side effects includes sedation and blood pressure spikes and disassociation, such as feelings of physical paralysis and out-of-body experiences. It also can cause suicidal thoughts and behaviors.

Acknowledging the dangers, FDA made esketamine available only through a restricted distribution system.

A veteran prescribed Spravato would inhale the nasal spray at a medical facility while under supervision of a medical provider, and would be monitored for at least two hours after receiving the dose. A typical prescription includes twice-weekly doses the first month, followed by a single dose weekly or biweekly as needed. Spravato cannot be dispensed for home use.

Spravato is made by Janssen Pharmaceuticals, a subsidiary of Johnson & Johnson. It is the first major antidepressant medication to hit the market in 30 years.



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Fast-Acting Depression Drug, Newly Approved, Could Help Millions

A nasal spray version of the drug ketamine has shown promise as an antidepressant, even if its properties still aren’t well understood.

Of the 16 million American adults who live with depression, as many as one-quarter gain little or no benefit from available treatments, whether drugs or talk therapy. They represent perhaps the greatest unmet need in psychiatry. On Tuesday, the Food and Drug Administration approved a prescription treatment intended to help them, a fast-acting drug derived from an old and widely used anesthetic, ketamine.

The move heralds a shift from the Prozac era of antidepressant drugs. The newly approved treatment, called esketamine, is a nasal spray developed by Janssen Pharmaceuticals Inc., a branch of Johnson & Johnson, that will be marketed under the name Spravato. It contains an active portion of the ketamine molecule, whose antidepressant properties are not well understood yet.

“Thank goodness we now have something with a different mechanism of action than previous antidepressants,” said Dr. Erick Turner, a former F.D.A. reviewer and an associate professor of psychiatry at Oregon Health & Science University. “But I’m skeptical of the hype, because in this world it’s like Lucy holding the football for Charlie Brown: Each time we get our hopes up, the football gets pulled away.”

The generic anesthetic is already increasingly available for depression, at hundreds of clinics around the country that provide a course of intravenous treatments, and studies suggest it can help treatment-resistant people. It often causes out-of-body and hallucinogenic sensations when administered; in the 1980s and 1990s it was popular as a club drug, Special K.

The cost for these treatments typically is out of pocket, as the generic anesthetic is not approved by the F.D.A. for depression. In contrast, esketamine likely would be covered under many insurance plans, and its side effects, though similar to those of generic ketamine, are thought to be less dramatic.

The recommended course of the newly approved drug is twice a week, for four weeks, with boosters as needed, along with one of the commonly used oral antidepressants. F.D.A. approval requires that doses be taken in a doctor’s office or clinic, with patients monitored for at least two hours, and their experience entered in a registry; patients should not drive on the day of treatment.

Esketamine, like ketamine, has the potential for abuse, and both drugs can induce psychotic episodes in people who are at high risk for them. The safety monitoring will require doctors to find space for treated patients, which could present a logistical challenge, some psychiatrists said.

The cost for a one-month course of treatment will be between $4,720 and $6,785, said Janssen, and experts said it will give the company a foothold in the $12 billion global antidepressant market, where most drugs now are generic.[L

The approval of esketamine marks a new approach to treating serious mood problems, experts said. Prozac and similar drugs enhance the activity of brain messengers such as serotonin; they are mildly effective, but they take weeks or months for their effects to be felt, and for many patients they provide little or no relief from depression. In contrast, the ketamine-based compounds — several others are being developed — work within hours or days, and are effective in some people who are considered “treatment resistant,” meaning they have not benefited from other antidepressants.

“These are exciting times, for sure,” said Dr. Todd Gould, an associate professor of psychiatry in the University of Maryland School of Medicine. “We have drugs that work rapidly to treat a very severe illness.” Dr. Gould was not involved in the Janssen study but has identified a metabolite, or ketamine breakdown product, that could be developed into another drug.

Experts with long experience in treating depression were encouraged by the news, but also chary. The effectiveness of the previous class of antidepressants such as Prozac and Paxil was vastly exaggerated when they came on the market. And the results of esketamine trials, which were paid for and carried out by Janssen, were mixed.

In each trial submitted, all patients were started on a new antidepressant drug, and given a course of esketamine treatment or a placebo. In one monthlong study, those on esketamine performed better statistically than those on placebo, reducing scores on a standard, 60-point depression scale by 21 points, compared to 17 points for placebo. But in two others trials, the drug did not statistically outperform placebo treatment. Historically, the F.D.A. has required that a drug succeed in two short-term trials before it is approved; the agency loosened its criteria for esketamine, opting instead to study relapse in people who did well on the drug.

In that trial, Janssen reported that only about one-quarter of subjects relapsed, compared to 45 percent of subjects who received the placebo spray. All the subjects had been given a diagnosis of treatment-resistant depression, or T.R.D., having previously failed multiple courses of drug treatment.

“We’ve had nothing new in 30 years,” said Steven Hollon, a professor of psychiatry and behavior sciences at Vanderbilt University. “So if this drug is an effective way to get a more rapid response in people who are treatment resistant, and we can use it safely, then it could be a godsend.”

One question that will need to be answered is how well esketamine performs in comparison to intravenous ketamine.

Theresa, 57, an adjunct professor of English in New York, who asked that her last name be omitted to protect her privacy, has lived much of her life with deep depression. She tried a course of I.V. generic ketamine last summer, at a local clinic, which typically entails a half-dozen infusions, given over a couple of weeks, for about $500 apiece, with follow-up “booster” treatments as needed.

“I remember floating, I was really high,” she said. “I was tripping on sounds, textures and shapes, that was very much a part of it.”

The first infusion provided no relief, she said. But after the third or fourth, she noticed a satisfying “shift” in her underlying mood. “It’s a hard thing to describe. I was still anxious, but I felt somehow more solid, like something gelled within me, and my husband has noticed it, too.”

Dr. Glen Brooks, the founder and medical director of NY Ketamine Infusions, a clinic in downtown Manhattan, said he has treated some 2,300 people, of all ages, with intravenous ketamine, the generic anesthetic. His clients had received a variety of diagnoses, including post-traumatic stress, anxiety, and obsessive-compulsive disorder, as well as depression.

“What they all have in common is that other medications have failed,” Dr. Brooks, an anesthesiologist, said. “They’re hopeless, and they think, ‘Nothing else has worked, why should this?’” He said that, in his experience, the infusions quickly reduced symptoms for teenagers and young adults, but seemed to be less effective for people over 50.

The data that Janssen presented to the F.D.A. likewise suggested that esketamine was less effective in people aged 65 and older, barely better than placebo treatment.

Ketamine was developed more than five decades ago as a safer alternative to the anesthetic phencyclidine, or PCP, and is used worldwide, in operating rooms, on the battlefield and in pediatric clinics. The World Health Organization has listed ketamine as one of its essential medicines since 1985.

By the 1990s, interest turned to the drug’s potential to combat depression, when a government scientist named Phil Skolnick argued that targeting glutamate pathways — the primary “excitatory,” or neuroactivating, brain processes — could produce antidepressant effects. In 2000, a team of researchers at Yale University and the Connecticut Mental Health Center, led by Dr. Robert M. Berman, reported that doses of ketamine provided quick relief to seven people with depression.

The field took off in 2006, when a team at the National Institute of Mental Health led by Dr. Carlos Zarate Jr. reported that 18 treatment-resistant people who received the drug intravenously reported that their despair lifted within hours.

“What seems remarkable is that the drug also seems to help domains other than depression, like anxiety, suicidal thinking, and anhedonia” — the inability to feel pleasure — said Dr. Zarate, chief of the N.I.M.H.’s experimental therapeutics and pathophysiology branch. “It seems to have more broad effects, on many areas of mood.”

The apparent ability of ketamine to blunt suicidal thinking is particularly compelling, and Janssen is pursuing this indication for esketamine. In jails and psychiatry wards, suicide is an acute risk for people in crisis, and a fast-acting drug could save many lives, doctors said.

For now, no one knows whether esketamine, or any of the other ketamine-based compounds being studied, are any more effective than the generic anesthetic itself — or, for that matter, whether the out-of-body and hallucinatory “side effects” are in fact integral to its antidepressant properties.

“For that, we will need head-to-head studies,” Dr. Zarate said. “And we don’t have those yet.”





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FDA approves ketamine-like nasal spray for depression

The US Food and Drug Administration approved Janssen Pharmaceuticals Inc.’s esketamine on Tuesday for treatment-resistant depression; the drug is the chemical cousin of ketamine, the powerful anesthetic that has been used illegally as the club drug Special K.It will be sold as Spravato. More specifically, it’s for patients who have tried at least two other medications without success, and it should be taken with an oral antidepressant.”There has been a longstanding need for additional effective treatments for treatment-resistant depression, a serious and life-threatening condition,” Dr. Tiffany Farchione, acting director of the Division of Psychiatry Products at the FDA’s Center for Drug Evaluation and Research, said in a news release announcing the approval.Spravato is a nasal spray administered by an approved health care provider in a doctor’s office or a medical clinic. It may also be self-administered but only under the supervision of a care provider and cannot be taken home.  “Because of [safety] concerns, the drug will only be available through a restricted distribution system and it must be administered in a certified medical office where the health care provider can monitor the patient,” Farchione said.Depending on the severity of the patient’s depression, it is given either once a week or once every other week.

Esketamine is an option for patients with treatment-resistant depression.

 Esketamine is an option for patients with treatment-resistant depression.The drug is rapidly acting, so it starts working faster than other antidepressants, according to Janssen. It works by restoring brain cells in patients with treatment-resistant depression.Currently available treatments for major depression are ineffective in 30% to 40% of patients. According to the FDA, there is one other approved medication for treatment-resistant depression, Symbyax, which was approved in 2009.Side effects of Spravato include dizziness, nausea, vertigo, anxiety, lethargy, increased blood pressure, vomiting, feeling drunk, decreased sensitivity, sedation and dissociation, a feeling of being temporarily “disconnected” from your body and your mind.The drug label will contain a “boxed warning” to alert patients to the risk of “sedation, and difficulty with attention, judgment and thinking (dissociation), abuse and misuse, and suicidal thoughts and behaviors after administration of the drug,” the agency said in its announcement.Because of these risks, patients must be monitored for at least two hours after being given the drug.Get CNN Health’s weekly newsletterIn clinical trials, six patients who were taking the drug died, three from suicide, but FDA background materials reviewed by the advisory committee that recommended approval last monthsaid, “It is difficult to consider these deaths as drug-related.”Because of the drug’s close relationship to ketamine, experts have raised concerns about its potential for misuse and abuse, but clinical trials found those risks to be unfounded.Concerns have also been raised about a lack of long-term data on possible health effects, most notably cognitive ones.The drug was designated as a breakthrough therapy in 2013, a status intended to “expedite the development and review of drugs for serious or life-threatening conditions,” the FDA said at the time.Greg Panico, a spokesman for Janssen, a division of Johnson & Johnson, did not say when Spravato will be available. He wrote in an email, “We are working quickly to educate and certify treatment centers on the unique administration requirements of SPRAVATO™ to ensure patients can access this important medicine.”As for the cost, it will be “generally comparable with other specialty mental health drugs,” Panico said: about $590 to $885 per treatment session, based on the dosage and not accounting for mandatory discounts or negotiated rebates.

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Ketamine Seems to Ease Depression. We’ll Soon See What Else It Does.



Clinical trials are not enough to prove any drug is safe and effective – especially one that could be as widely used as Johnson & Johnson’s depression drug esketamine, a slightly altered form of the street drug ketamine. The FDA approval process is a balancing act, weighing safety and efficacy testing against the need to get potentially life-saving drugs out as soon as possible.

An advisory panel to the FDA decided this month that the benefits outweigh the risks, and approval is expected soon. But scientists who study depression say there’s a lot more to learn about esketamine’s long-term effects.

While best known as a recreational drug, ketamine has been used since the 1970s as an anesthetic, in doses much higher than what’s likely to be given to depression patients. The trials so far seem to show that the drug is not highly addictive, according to a story in the medical website STAT. But time will tell.

The most promising clinical trials followed people whose depression had been resistant to conventional therapy. Fifty percent of patients improved when given conventional therapy plus a placebo, as compared to 70 percent who got conventional therapy and esketamine.

Taking the drug will be a lot more complicated than taking Prozac. It’s been formulated so that it can be delivered as a nasal spray, but people have to get the drug at a doctor’s office, and they won’t be allowed to drive for at least 24 hours, said Gerard Sanacora, a Yale University psychiatrist who has been involved in the clinical trials.

He said he believes there’s potential for benefit, because the drug works for some people who get no relief from conventional treatments and because works faster, which might even prevent suicide. But there’s a lot more to learn about the drug’s potential long-term consequences. So far it looks like people will get two treatments a week to start, then one for maintenance. But scientists don’t know whether it can be tapered down further, or discontinued, and whether there’s a risk for relapse, he said.

Sanacora said that ketamine is based on a very different model of how depression works. Standard therapy is based on the principle that depression is a chemical imbalance involving the transmitting chemical serotonin. But an alternative view started to take shape in the 1990s that depression was more of a problem with the connections between neurons, triggered by chronic stress and mediated by something called the glutaminergic system.

Because ketamine interacts with this system, researchers started testing it as a depression drug. Although it seems effective, there’s still no agreement on how depression actually works – and there is some concern that it might work very differently in different patients.

Ketamine can affect cardiovascular health, and in the short term can cause patients to lose their sense of their bodies’ position in space – the sense of proprioception. They sometimes feel their arms are floating.

That hasn’t stopped people from flocking to clinics to get treated with IV ketamine infusions for depression and other problems. This is legal because the drug is approved for anesthesia, and prescribers can use it off-label for other purposes. An investigation by the medical website STAT raised concerns that clinic staff didn’t have the necessary expertise, and there was considerable marketing hype in many cases. The infusions cost between $350 and $1,000 each, and can go on for five or six treatments.

Another red flag popped up last week when the Boston Globe ran a storyabout three women who claim to have been sexually abused by psychiatrist Keith Ablow – a frequent commentator for Fox News. The Globe reported that Ablow was treating the women with ketamine, and one expert cited in the lawsuits said a patient had become “very dependent on this medication and dependent on Dr. Ablow to supply it.”

Ablow’s Twitter feed is full of positive stories about ketamine in places such as Reader’s Digest, followed by a phone number to call for a “free ketamine screening.” The allegations illustration that it’s not just patients that will need to be tracked for abuse, but the doctors as well.

On the positive side, FDA approval would give patients who want the drug a standardized treatment that would be covered by many insurance plans. Approval also creates an opportunity to collect data on longer-term use. (An earlier column exploring the promise of big data in medicine points out that clinical trials are often not long-running enough or big enough to catch even deadly side effects.)

Yale’s Sanacora thinks of the next series of trials as Phase 4. Sanacora also brought up what he poignantly called the “Flowers for Algernon” effect, referring to the short story in which the main character, Charlie Gordon, is treated for an intellectual disability. The treatment works, but eventually wears off, leaving Charlie back where he started. The disappointment makes for a tragic tale. An arc like this would be the last thing depression patients need – though if no other treatment is helping, it might be a risk worth taking.

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Ketamine Virginia Link



Ketamine Works as a Fast-Acting Antidepressant, But the Full Effects Are Still Unknown

Ketamine Works as a Fast-Acting Antidepressant, But the Full Effects Are Still Unknown

etamine leads something of a double life, straddling the line between medical science and party drug. Since it’s invention in the early 1960s, ketamine has enjoyed a quiet existence as a veterinary and pediatric anesthetic given in high doses. But in a second, wilder life, ketamine’s effects at lower doses—a profound sense of dissociation from self and body—became an illicit favorite among psychedelic enthusiasts. Pioneering neuroscientist John Lilly, who famously attempted to facilitate communication between humans and dolphins, used the drug in the late 1970s during experiments in sensory deprivation tanks. By the 1990s, the drug had made its way to the dance floor as “special K.”

More recently, ketamine has taken on a third, wholly unexpected role. Since the early 2000s, the drug has been studied as a uniquely powerful medication for treating severe depression and obsessive-compulsive disorder (OCD). When given as an intravenous infusion, ketamine can lift symptoms of depression and OCD from patients who fail to respond to common antidepressants like Prozac and even resist treatments like electroconvulsive therapy (ECT).

Exactly how ketamine produces antidepressant effects remains unclear, however. Antidepressants like Prozac are Serotonin Reuptake Inhibitors (SSRIs) that increase levels of the neurotransmitter serotonin in the brain, which is believed to boost mood. Ketamine’s main mechanism of action to produce dissociative anesthetic effects, on the other hand, depends on another neurotransmitter, glutamate.

“The prevailing hypothesis for ketamine’s antidepressant effect is that it blocks a receptor (or docking port) for glutamate,” says Carolyn Rodriguez, a professor of psychiatry at Stanford who has conducted some of the pioneering research into ketamine as an OCD treatment.

However, new research suggests that ketamine’s influence on glutamate receptors, and specifically the NMDA receptor, may not be the sole cause of its antidepressant effects. According to a recent study in the American Journal of Psychiatry by Rodriguez and her Stanford colleagues, ketamine might also activate a third system in the brain: opioid receptors.

Ketamine is known to bind weakly to the mu opioid receptor, acting as an agonist to produce a physiological response at the same site in the brain where narcotics like morphine exert their influence. It’s also known that opioids can have antidepressant effects, says Alan Schatzberg, a professor of psychiatry at Stanford and co-author of the new study.

It never made sense to Schatzberg that ketamine’s antidepressant effects were a result of blocking the glutamate receptors, as attempts to use other glutamate-blocking drugs as antidepressants have largely failed. The Stanford psychiatrist, who has spent his career studying depression, wondered if researchers were unknowingly activating opioid receptors with ketamine.

“You could test this by using an antagonist of the opioid system to see if you blocked the effect in people who are ketamine responders,” he says. “And that’s what we did.”

The researchers enlisted 12 subjects with treatment-resistant depression and gave them either an infusion of ketamine preceded by a placebo, or ketamine preceded by a dose of naltrexone, an opioid receptor blocker. Of those, seven subjects responded to the ketamine with placebo, “and it was very dramatic,” Schatzberg says, with depression lifting by the next day. “But in the other condition, they showed no effect,” suggesting it was the opioid receptor activity, not blocking glutamate receptors, that was responsible.

While opioid blockers prevented ketamine from activating the associated receptors, it did not block the drugs dissociative effects, suggesting dissociation alone won’t affect depression. “It’s not that, ‘hey, we’ll get you a little weird and you’ll get the effect,’” Schatzberg says.

The appeal of ketamine’s use as an antidepressant is clear enough. While more typical antidepressants may require six to eight weeks to produce benefits, ketamine works within hours.

“Our patients are asked to hang in there until the medication and talk therapy takes effect,” says Carlos Zarate, chief of the experimental therapeutics and pathophysiology branch of the National Institute of Mental Health (NIMH) who was not associated with the new study. While waiting for traditional treatments to kick in, patients “may lose their friends or even attempt suicide.”

But the study linking ketamine to opioid activity means an extra dose of caution is required. While ketamine acts quickly, the anti-depressive effects of the drug only last for a few days to a week, meaning repeat doses would be needed in practice. Researchers and clinicians should consider the risk of addiction in long-term use, Schatzberg says. “You’re going to eventually get into some form of tolerance I think, and that’s not good.”

However, the new finding is based on just seven subjects, and it still needs to be replicated by other scientists, says Yale professor of psychiatry Greg Sanacora, who was not involved in the new study. And even if the trial is replicated, it would not prove ketamine’s opioid activity is responsible for its antidepressant effects.

“It doesn’t show that at all,” says Sanacora, who studies glutamate, mood disorders and ketamine. “It shows that the opioid system needs to be functioning in order to get this response.”

Sanacora compares the new study to using antibiotics to treat an ear infection. If you administered an additional drug that blocks absorption of antibiotics in the stomach, you would block treatment of the ear infection, but you wouldn’t conclude that antibiotics fight ear infections through stomach absorption—you just need a normally functioning stomach to allow the antibiotic to do its job. Similarly, opioid receptors might need to be functioning normally for ketamine to produce antidepressant effects, even if opioid activity is not directly responsible for those effects.

Complicating matters further, placebos often cause patients to experience less pain, but opioid blockers like naltrexone have been shown to prevent this response, according to Sanacora. It could be, he suggests, that all the apparatus of the clinic—the nursing staff, the equipment—exerted a placebo effect that is mediated by the brain’s opioid system, and the patients who received naltrexone simply did not respond to that placebo effect

“That’s a very important and powerful tool that is in all of medicine, not just in psychiatry,” Sanacora says. “And we know that the opiate system is involved, to some extent, in that type of response.”

It’s also possible, the researchers note in the paper, that ketamine’s action at the glutamate receptor is still important. “Ketamine acts in three distinct phases—rapid effects, sustained effects and return to baseline,” Rodriguez says. Opioid signaling may turn out to mediate ketamine’s rapid effects, while “the glutamate system may be responsible for the sustaining effects after ketamine is metabolized.”

One interpretation is that ketamine blocks glutamate receptors on neurons that are inhibitory, meaning they signal other neurons to fire fewer signals. By blocking these neurons from firing, ketamine may enhance glutamate activity in the rest of the brain, producing anti-depressive effects that persist after the opioid activity dies down.

“The reality is it’s in a gray zone,” Sanacora says. “This is just one small piece of a very large puzzle or concern that we really need to look at the data in total.”

That data is forthcoming. Results from a Janssen Pharmaceuticals clinical trial using esketamine, an isomer of ketamine, and involving hundreds of subjects will soon become public, according to Sanacora, who has consulted for the company. And at NIMH, Zarate and colleagues are studying hydroxynorketamine, a metabolite of ketamine that may provide the same benefits but without the dissociative side effects

Ketamine Works as a Fast-Acting Antidepressant, But the Full Effects Are Still Unknown

A new study suggests that ketamine activates the brain’s opioid receptors, complicating its use to treat clinical depression

Ketamine Syringe
Ketamine syringe, 10mg held by a healthcare professional. (Peter Cripps / Alamy Stock Photo)

By Jon KelveySEPTEMBER 11, 2018777110231.1K

Ketamine leads something of a double life, straddling the line between medical science and party drug. Since it’s invention in the early 1960s, ketamine has enjoyed a quiet existence as a veterinary and pediatric anesthetic given in high doses. But in a second, wilder life, ketamine’s effects at lower doses—a profound sense of dissociation from self and body—became an illicit favorite among psychedelic enthusiasts. Pioneering neuroscientist John Lilly, who famously attempted to facilitate communication between humans and dolphins, used the drug in the late 1970s during experiments in sensory deprivation tanks. By the 1990s, the drug had made its way to the dance floor as “special K.”

More recently, ketamine has taken on a third, wholly unexpected role. Since the early 2000s, the drug has been studied as a uniquely powerful medication for treating severe depression and obsessive-compulsive disorder (OCD). When given as an intravenous infusion, ketamine can lift symptoms of depression and OCD from patients who fail to respond to common antidepressants like Prozac and even resist treatments like electroconvulsive therapy (ECT).

Exactly how ketamine produces antidepressant effects remains unclear, however. Antidepressants like Prozac are Serotonin Reuptake Inhibitors (SSRIs) that increase levels of the neurotransmitter serotonin in the brain, which is believed to boost mood. Ketamine’s main mechanism of action to produce dissociative anesthetic effects, on the other hand, depends on another neurotransmitter, glutamate.

“The prevailing hypothesis for ketamine’s antidepressant effect is that it blocks a receptor (or docking port) for glutamate,” says Carolyn Rodriguez, a professor of psychiatry at Stanford who has conducted some of the pioneering research into ketamine as an OCD treatment.

However, new research suggests that ketamine’s influence on glutamate receptors, and specifically the NMDA receptor, may not be the sole cause of its antidepressant effects. According to a recent study in the American Journal of Psychiatry by Rodriguez and her Stanford colleagues, ketamine might also activate a third system in the brain: opioid receptors.

Ketamine is known to bind weakly to the mu opioid receptor, acting as an agonist to produce a physiological response at the same site in the brain where narcotics like morphine exert their influence. It’s also known that opioids can have antidepressant effects, says Alan Schatzberg, a professor of psychiatry at Stanford and co-author of the new study.

It never made sense to Schatzberg that ketamine’s antidepressant effects were a result of blocking the glutamate receptors, as attempts to use other glutamate-blocking drugs as antidepressants have largely failed. The Stanford psychiatrist, who has spent his career studying depression, wondered if researchers were unknowingly activating opioid receptors with ketamine.

“You could test this by using an antagonist of the opioid system to see if you blocked the effect in people who are ketamine responders,” he says. “And that’s what we did.”

The researchers enlisted 12 subjects with treatment-resistant depression and gave them either an infusion of ketamine preceded by a placebo, or ketamine preceded by a dose of naltrexone, an opioid receptor blocker. Of those, seven subjects responded to the ketamine with placebo, “and it was very dramatic,” Schatzberg says, with depression lifting by the next day. “But in the other condition, they showed no effect,” suggesting it was the opioid receptor activity, not blocking glutamate receptors, that was responsible.

While opioid blockers prevented ketamine from activating the associated receptors, it did not block the drugs dissociative effects, suggesting dissociation alone won’t affect depression. “It’s not that, ‘hey, we’ll get you a little weird and you’ll get the effect,’” Schatzberg says.

The appeal of ketamine’s use as an antidepressant is clear enough. While more typical antidepressants may require six to eight weeks to produce benefits, ketamine works within hours.

“Our patients are asked to hang in there until the medication and talk therapy takes effect,” says Carlos Zarate, chief of the experimental therapeutics and pathophysiology branch of the National Institute of Mental Health (NIMH) who was not associated with the new study. While waiting for traditional treatments to kick in, patients “may lose their friends or even attempt suicide.”

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A treatment that works within 24 hours? “That’s huge.”

A vial of ketamine. The drug is used primarily as an anesthetic but is gaining popularity as an effective antidepressant.
A vial of ketamine. The drug is used primarily as an anesthetic but is gaining popularity as an effective antidepressant. (Wikimedia Commons)

But the study linking ketamine to opioid activity means an extra dose of caution is required. While ketamine acts quickly, the anti-depressive effects of the drug only last for a few days to a week, meaning repeat doses would be needed in practice. Researchers and clinicians should consider the risk of addiction in long-term use, Schatzberg says. “You’re going to eventually get into some form of tolerance I think, and that’s not good.”

However, the new finding is based on just seven subjects, and it still needs to be replicated by other scientists, says Yale professor of psychiatry Greg Sanacora, who was not involved in the new study. And even if the trial is replicated, it would not prove ketamine’s opioid activity is responsible for its antidepressant effects.

“It doesn’t show that at all,” says Sanacora, who studies glutamate, mood disorders and ketamine. “It shows that the opioid system needs to be functioning in order to get this response.”

Sanacora compares the new study to using antibiotics to treat an ear infection. If you administered an additional drug that blocks absorption of antibiotics in the stomach, you would block treatment of the ear infection, but you wouldn’t conclude that antibiotics fight ear infections through stomach absorption—you just need a normally functioning stomach to allow the antibiotic to do its job. Similarly, opioid receptors might need to be functioning normally for ketamine to produce antidepressant effects, even if opioid activity is not directly responsible for those effects.

Complicating matters further, placebos often cause patients to experience less pain, but opioid blockers like naltrexone have been shown to prevent this response, according to Sanacora. It could be, he suggests, that all the apparatus of the clinic—the nursing staff, the equipment—exerted a placebo effect that is mediated by the brain’s opioid system, and the patients who received naltrexone simply did not respond to that placebo effect.

“That’s a very important and powerful tool that is in all of medicine, not just in psychiatry,” Sanacora says. “And we know that the opiate system is involved, to some extent, in that type of response.”

It’s also possible, the researchers note in the paper, that ketamine’s action at the glutamate receptor is still important. “Ketamine acts in three distinct phases—rapid effects, sustained effects and return to baseline,” Rodriguez says. Opioid signaling may turn out to mediate ketamine’s rapid effects, while “the glutamate system may be responsible for the sustaining effects after ketamine is metabolized.”

One interpretation is that ketamine blocks glutamate receptors on neurons that are inhibitory, meaning they signal other neurons to fire fewer signals. By blocking these neurons from firing, ketamine may enhance glutamate activity in the rest of the brain, producing anti-depressive effects that persist after the opioid activity dies down.

“The reality is it’s in a gray zone,” Sanacora says. “This is just one small piece of a very large puzzle or concern that we really need to look at the data in total.”

That data is forthcoming. Results from a Janssen Pharmaceuticals clinical trial using esketamine, an isomer of ketamine, and involving hundreds of subjects will soon become public, according to Sanacora, who has consulted for the company. And at NIMH, Zarate and colleagues are studying hydroxynorketamine, a metabolite of ketamine that may provide the same benefits but without the dissociative side effects.

The ultimate goal of all this research is to find a ketamine-like drug with fewer liabilities, and that aim is bringing researchers back to the fundamentals of science.

“For me, one of the exciting parts of this study is that it suggests that ketamine’s mechanism is complicated, it acts on different receptors beyond glutamate and is the start of this exciting dialogue,” Rodriguez says. “Sometimes great science raises more questions than answers.”



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What is interesting for the above articles is the Magnesium and copper components associated with Depression.

The most common biomarkers found are generally related to the regulation of lipid metabolism, control of immunoinflammatory response, control of vascular function, inter and intra-cellular communication. We additionally found that biomarkers related to nutrient sensing and proteostasis are related to LLD. Altogether, these studies suggest that there are core abnormalities, which are present in the first depressive episode, continue over mid-life and late-life, and are persistent even after successful antidepressant treatment. This view is consistent with the presence of biological “scars” in depression that render individuals with major depression , age, more vulnerable to systemic illness, disability, cognitive impairment and other negative health outcomes, which are not fully ameliorated despite successful antidepressant treatment . Robust machine learning techniques showed that three proteins (C-peptide, fatty acid-binding protein, and ApoA-IV) have a very high accuracy at discriminating individuals with remitted LLD compared to never depressed control participants. In fact, our study showed the highest discriminatory power of any previous studies, including those for schizophrenia, bipolar disorder or other common mental illnesses .

http://software.broadinstitute.org/gsea/msigdb

. LLD is associated with significantly higher levels of pro-inflammatory and lower levels of anti-inflammatory markers, reduced neurotrophic support, and higher levels of oxidative stress markers and activity of glycogen synthase kinase

I nflammation is a key pathway in the initiation and progression of coronary heart disease (CHD), and inflammatory biomarkers such as C-reactive protein (CRP) and interleukin-6 (IL-6) have shown consistent associations with incident CHD events (1). In recent years, myeloperoxydase (MPO) has drawn growing attention as a new inflammatory biomarker of CHD risk (2–4). Myeloperoxydase is an enzyme produced by activated leukocytes during the innate immune response that catalyzes the formation of reactive oxidant species. It is present in human atherosclerotic plaques and exhibits a variety of proatherogenic properties (5). Increased inflammation is a key mechanism through which several risk factors increase CHD risk (6). Depression is a risk factor for CHD (7), and whether increased inflammation is involved has attracted considerable interest (8). A role of inflammation in depression was first proposed by Smith in 1991 (9). Since then, several studies have reported a link between major depressive disorder (MDD) or depressive symptoms and a variety of inflammatory and immune biomarkers (10 –15). However, others have found no independent association (16) or mixed results (17–19), and one study even found lower levels of inflammatory biomarkers in depressed cardiac outpatients (20). It is increasingly recognized that the relationship between depression and inflammation is more complex than initially conceived (21). Depression may cause inflammation through altered neuroendocrine function and central adiposity (22). However, depression may also be a consequence of inflammation, since a pathogenic role of inflammatory cytokines in the etiology of depression has been described (23). Although given less consideration, a third possibility is that depression is a marker of some other underlying dimension that is separately linked to depression and inflammation. Recently, it has been proposed that such underlying factor could be a specific genetic makeup (24,25). Evidence for a common genetic substrate for depression and inflammation would be of substantial scientific and clinical interest, because it would suggest that a common biological pathway links these two conditions. We found that MDD is associated with higher levels of inflammation and that this association is particularly robust for MPO, an inflammatory biomarker that was never studied before in relation to depression. However, we also found evidence for genetic confounding in this association. Our results are consistent with the hypothesis that there is a common genetic substrate linking MDD and inflammation, suggesting that these two phenotypes share a common pathophysiological mechanism. MPO, Other Inflammatory Markers, and Depression Myeloperoxydase is an enzyme of the innate immune system, which exhibits a wide array of proatherogenic features (5,34). Myeloperoxydase is secreted upon leukocyte activation, contributing to innate host defenses. However, it also increases oxidative stress, thereby contributing to tissue damage during inflammation and atherogenesis. Myeloperoxydase generates numerous reactive oxidants that cause lipid peroxidation, posttranslational modifications to target proteins, and decrease of nitric oxide bioavailability, resulting in oxidation of LDL and apolipoprotein A1, protein carbamylation, and endothelial dysfunction (5,35,36). Transgenic mice containing the human MPO gene show significantly larger atherosclerosis buildup than the wild-type (34,37). In humans, individuals with total or subtotal MPO deficiency, a defect with a frequency of 1 in every 2000 to 4000 whites, are less likely to develop cardiovascular diseases, and those harboring a promoter polymorphism associated with a twofold reduction in MPO expression appear cardioprotected (5,38 – 40). Consistent with these proatherogenic properties, MPO has received growing attention as a novel risk marker for future cardiovascular events (2– 4). Oxidative stress has also been linked to neuronal degeneration in the central nervous system (41,42). Myeloperoxydase is both expressed and enzymatically active in the human brain (43,44) and is associated with Alzheimer’s disease (44). Previous studies have described abnormalities of oxidant-antioxidant systems in MDD suggestive of higher oxidative stress. For example, elevated levels of antioxidant enzymes, particularly superoxide dismutase (SOD), and biomarkers of oxidation, such as malondialdehyde, were found in plasma, red blood cells, or other peripheral tissues of acutely depressed MDD patients compared with control subjects (45– 47). In some cases (46,47), but not others (45), these abnormalities were reduced with antidepressant treatment. Superoxide dismutase coenzyme concentrations are also higher in postmortem brain tissue (prefrontal cortex) of MDD patients than in control brains (48).

MOOD FOOD Project

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Ketamine-like depression treatment on track for FDA approval

 

Ketamine offers lifeline for people with severe depression, suicidal thoughtsThe drug is a close relative of ketamine, a powerful medication used in hospitals primarily as an anesthetic; recent scientific studies have also shown its potential with treatment-resistant depression and suicidal ideation. Ketamine is also used recreationally — and illegally — as a club drug known as Special K. It generates an intense high and dissociative effects.Esketamine, which is not FDA-approved for any conditions, targets a different brain pathway than approved antidepressants, many of which have been around for decades. It is expected to be used in combination with antidepressants, but the latter can take a month or two to take effect. Esketamine, on the other hand, might have an effect within hours or days, according to an FDA briefing document.The drug was designated as a breakthrough therapy in 2013, intending to “expedite the development and review of drugs for serious or life-threatening conditions,” the FDA says. First-line treatments don’t work for roughly 30% to 40% of patients with major depressive disorder, according to the briefing document.The FDA does not have to follow the recommendation of advisory committees, though it often does.

ERs 'flooded' with mentally ill patients with no place else to turn

ERs ‘flooded’ with mentally ill patients with no place else to turnHowever, the research behind esketamine has come under some criticism, with two of five key studies failing to meet their primary endpoints. Only one of these studies is a positive short-term trial, whereas most FDA-approved antidepressants are backed by at least two, according to the briefing document. But Janssen has maintained that the overall picture is positive.Adverse events tended to occur in the first two hours patients received the drug, including sedation, blood pressure increases and dissociation. For this reason, patients wouldn’t be able to pick it up at a local pharmacy; it would be given under the supervision of health care professionals who can keep an eye on the person during those first two hours.Because of the drug’s close relationship to ketamine, experts have also raised concerns about its potential for misuse and abuse. The clinical trials have not seen evidence of this risk, according to presentations made during the meeting.Advisory panelists also expressed concern that not enough long-term data was available to characterize the drug’s cognitive effects and other health impacts down the line.Get CNN Health’s weekly newsletter

There were six deaths of patients taking esketamine in trials, including three suicides, but FDA materials concluded “it is difficult to consider these deaths as drug-related.”The only current FDA-approved medication for treatment-resistant depression combines two other drugs already on the market. Other non-pharmaceutical treatments exist, such as electroconvulsive therapy.Janssen spokesman Greg Panico said no information about pricing would be available at this time. An FDA decision is expected in early March, he added.

 

CNN)A ketamine-like drug for treatment-resistant depression was backed by a US Food and Drug Administration advisory committee on Tuesday. If it is then approved by the FDA, the drug — called esketamine — may provide a new option for patients with major depressive disorder who have tried at least two other antidepressants without success.A panel of experts voted to endorse the drug, which is made in nasal spray form by the pharmaceutical company Janssen, a division of Johnson & Johnson. Fourteen members voted that the benefits outweighed the risk, with two opposed and one abstaining.

Ketamine offers lifeline for people with severe depression, suicidal thoughts
703-844-0184 | NOVA Health Recovery | Alexandria, Va 22306

Ketamine offers lifeline for people with severe depression, suicidal thoughtsThe drug is a close relative of ketamine, a powerful medication used in hospitals primarily as an anesthetic; recent scientific studies have also shown its potential with treatment-resistant depression and suicidal ideation. Ketamine is also used recreationally — and illegally — as a club drug known as Special K. It generates an intense high and dissociative effects.Esketamine, which is not FDA-approved for any conditions, targets a different brain pathway than approved antidepressants, many of which have been around for decades. It is expected to be used in combination with antidepressants, but the latter can take a month or two to take effect. Esketamine, on the other hand, might have an effect within hours or days, according to an FDA briefing document.The drug was designated as a breakthrough therapy in 2013, intending to “expedite the development and review of drugs for serious or life-threatening conditions,” the FDA says. First-line treatments don’t work for roughly 30% to 40% of patients with major depressive disorder, according to the briefing document.The FDA does not have to follow the recommendation of advisory committees, though it often does.

ERs 'flooded' with mentally ill patients with no place else to turn

ERs ‘flooded’ with mentally ill patients with no place else to turnHowever, the research behind esketamine has come under some criticism, with two of five key studies failing to meet their primary endpoints. Only one of these studies is a positive short-term trial, whereas most FDA-approved antidepressants are backed by at least two, according to the briefing document. But Janssen has maintained that the overall picture is positive.Adverse events tended to occur in the first two hours patients received the drug, including sedation, blood pressure increases and dissociation. For this reason, patients wouldn’t be able to pick it up at a local pharmacy; it would be given under the supervision of health care professionals who can keep an eye on the person during those first two hours.Because of the drug’s close relationship to ketamine, experts have also raised concerns about its potential for misuse and abuse. The clinical trials have not seen evidence of this risk, according to presentations made during the meeting.Advisory panelists also expressed concern that not enough long-term data was available to characterize the drug’s cognitive effects and other health impacts down the line.Get CNN Health’s weekly newsletter

There were six deaths of patients taking esketamine in trials, including three suicides, but FDA materials concluded “it is difficult to consider these deaths as drug-related.”The only current FDA-approved medication for treatment-resistant depression combines two other drugs already on the market. Other non-pharmaceutical treatments exist, such as electroconvulsive therapy.Janssen spokesman Greg Panico said no information about pricing would be available at this time. An FDA decision is expected in early March, he added.

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A Randomized Controlled Trial of Intranasal Ketamine in Major
Depressive Disorder

A Randomized Controlled Trial of Intranasal Ketamine in Major Depressive Disorder

Abstract
Background—The N-methyl-d-aspartate glutamate receptor antagonist ketamine, delivered via
an intravenous route, has shown rapid antidepressant effects in patients with treatment-resistant
depression. The current study was designed to test the safety, tolerability and efficacy of intranasal
ketamine in patients with depression who had failed at least one prior antidepressant trial.
Methods—Twenty patients with major depression were randomized and 18 completed two
treatment days with intranasal ketamine hydrochloride (50 mg) or saline solution in a randomized,
double-blind, crossover study. The primary efficacy outcome measure was change in depression
severity 24 hours following ketamine or placebo, measured using the Montgomery-Asberg
Depression Rating Scale. Secondary outcomes included persistence of benefit, changes in selfreports of depression, changes in anxiety, and proportion of responders. Potential
psychotomimetic, dissociative, hemodynamic, and general adverse effects associated with
ketamine were also measured.

Results—Patients showed significant improvement in depressive symptoms at 24 hours
following ketamine compared to placebo [t=4.39, p<0.001; estimated mean MADRS score
difference of 7.6 ± 3.7 (95% CI: 3.9 – 11.3)]. Eight of 18 patients (44%) met response criteria 24
hours following ketamine administration, compared to 1 of 18 (6%) following placebo (p=0.033).
Intranasal ketamine was well tolerated with minimal psychotomimetic or dissociative effects and
was not associated with clinically significant changes in hemodynamic parameters.

Conclusions—This study provides the first controlled evidence for the rapid antidepressant
effects of intranasal ketamine. Treatment was associated with minimal adverse effects. If
replicated, these findings may lead to novel approaches to the pharmacologic treatment of patients
with major depression

Intranasal ketamine has shown safety and efficacy as an anesthetic and analgesic agent (16–
20). In particular, intranasal ketamine has been successfully used in the treatment of
headache and pain in ambulatory patients (21–23). In one study, 50 mg of ketamine
administered intranasally was well tolerated and led to symptomatic improvement in chronic
pain (23). The objective of the current proof of concept clinical trial was to test the rapid
antidepressant effect of a single 50 mg administration of ketamine via an intranasal route in
patients with major depression who had failed to respond to at least one prior antidepressant
trial. Based on accumulating evidence supporting the efficacy and tolerability of ketamine
administered IV in depression, and prior research examining intranasal ketamine in pain, we
hypothesized that a dose of 50 mg, administered via an intranasal route, would be safe, well
tolerated and lead to a rapid reduction in depressive symptoms.

DISCUSSION
In the current study we found that a single dose of 50 mg of ketamine administered via
intranasal route was associated with a rapid antidepressant response in patients with major
depression who had failed at least one prior antidepressant trial. A significant antidepressant
effect of ketamine was detected as early as 40 min following administration and there was a
large difference in depression severity between the treatment conditions at the 24-hour
primary outcome (mean difference in MADRS score of 7.6 ± 3.7). In aggregate, there was
significant antidepressant benefit following ketamine compared to placebo over the full 7-
day assessment period, although when comparing individual time points the treatment
conditions no longer separated at 72 hours or 7 days. Ketamine was associated with
significant improvement in anxiety symptoms and self-reports of depressive symptoms at 24
hours. Intranasal ketamine was well tolerated with only very minimal increases in
dissociation, psychosis-like symptoms or hemodynamic parameters. This study provides the
first randomized, controlled evidence that intranasal ketamine is safe, well tolerated, and
effective for rapid reduction of depressive symptoms in patients with MDD and at least mild
treatment resistance.
In comparison with prior studies of ketamine administered IV (at a dose of 0.5 mg/kg) in
depression, our observed magnitude of antidepressant effect with intranasal administration
may be somewhat reduced. Murrough et al. reported a mean ketamine-placebo difference of
7.95 points (95% CI: 3.20–12.71) on the MADRS 24 hours following a single IV infusion
and a response rate of 64% (15). Response rates as high as 70% following IV administration
have been reported in some studies (11, 15), though other studies have reported response
rates from 50% to as low as 30% following IV ketamine (28, 29). Our mean drug-placebo
difference is in line with what has been previously reported (7.6 ± 3.7 points on the
MADRS), although the proportion of responders in our study may be somewhat lower at
44%. This lower proportion of treatment responders may be consistent with the lower blood
ketamine levels achieved in our study compared to levels previously reported following IV
administration. In our sample, the mean ketamine blood level was 72 ng/mL at 20 min and
84 ng/mL at 40 min. In contrast, mean ketamine levels reported following IV infusion
(0.5mg/kg) are approximately 150 ng/mL at 30 min and 200 ng/mL at 40 min. (27, 30, 31).
It is currently not known if efficacy equivalent to IV administration can be obtained by
intranasal administration in the case that comparable blood levels can be achieved.

We report a significant improvement in anxiety symptoms at 24 hours, assessed with the
HAM-A. Two studies of IV ketamine for bipolar depression reported a significant
improvement in anxiety symptoms measured with the HAM-A and a visual analog scale(27,
32). However, previous studies of patients with unipolar TRD have not described effects of
IV ketamine on anxiety, with the exception of an early RCT (11) and an open label study
(33) reporting significant improvement in psychic anxiety measured as an individual
symptom on the Hamilton Depression Rating Scale, and another open-label study reporting
significant decrease in anxiety symptoms on the HAM-A at +230 minutes (34).
Previous studies of IV ketamine in depression have reported elevations in measures of
psychotomimetic, dissociative and hemodynamic parameters (11, 13, 35). In our study, the
ketamine group experienced a very limited increase in dissociation at +40 min as measured
by the CADSS (mean 1.4 points; scale range 0–92). In comparison, Murrough et al. reported
a larger dissociative effect 40 min following ketamine administered IV [mean CADSS score
of 14.7 points (95% CI: 10.6–18.8)] (15). A similar pattern was observed for psychotic-like
effects measured using the BPRS+ (11, 15). We also observed comparatively small changes
in hemodynamic parameters. No patient met protocol criteria for interventions. Studies of IV
ketamine in depression have reported relatively greater changes in hemodynamic parameters
(mean systolic BP increase of 19.0 versus our 7.6 mmHg at +40mins relative to baseline)
(15). The reduced magnitude of acute behavioral and hemodynamic changes observed in the
current study may be consistent with the lower blood levels achieved compared to prior
studies with ketamine administered IV, as discussed above.
The bioavailability of ketamine administered via an intranasal route has been reported to be
between 25–50% (36). A study in healthy volunteers comparing administration methods
found intranasal ketamine bioavailability of 45%, higher than subligual, oral, or rectal
administration and found no significant differences in pharmacokinetics between
preparations, including injection (37). Additionally, this study found conversion to
norketamine was more similar between intranasal and injection than the other administration
methods, suggesting that first-pass metabolism is relatively absent with intranasal
administration. The area under the ketamine and norketamine plasma concentration-time
curves in that study was lowest for intranasal administration but was found to increase
almost linearly with doses from 25 to 50mg (37). In previous studies of IV ketamine in
depression, peak norketamine blood levels of approximately 20–50 ng/mL have been
reported (30, 31). In line with these findings, the mean norketamine level in our study was
46 ng/mL at 40 min.
We selected our dose of 50 mg largely based on a previous study using a similar design and
the same dose in patients with a chronic pain disorder (23). Based on an expected
bioavailability of intranasal ketamine between 25–50% (36), our dose may be approximately
equivalent to 0.15 – 0.34 mg/kg administered IV. Although this is lower than the standard
0.5 mg/kg IV frequently used in ketamine depression studies, we reasoned that this dose was
appropriate from a safety perspective given that the administration period in the current
study is relatively short (20 min versus 40 min or longer in IV studies). Clearly, much more
research is required in order to determine the optimal dose, duration, frequency and route of
administration of ketamine for depression