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Ketamine could be first of new generation of rapid acting antidepressants, say experts

Ketamine is the first truly new pharmacological approach to treating depression in the past 50 years and could herald a new generation of rapid acting antidepressants, researchers have predicted.

“We haven’t had anything really new for about 50 or 60 years,” said Allan Young, professor of mood disorders at the Institute of Psychiatry, Psychology and Neuroscience at King’s College, London, at a briefing on 12 July at London’s Science Media Centre.

Most of the new launches have been “tinkering with drugs which were really discovered in the ’50s and ’60s,” he explained. “Even the famous Prozac, which came in in the late ’80s, is really just a refinement of the tricyclic antidepressants that came in the ’50s. People say we are still in the age of steam, and we need to go to the next technological advance.”

Slow onset

In the past few years the focus has fallen on ketamine, which is used for pain relief and anaesthesia but is better known for being a horse sedative and a “club drug” that can induce hallucinations and calmness. It has been found to have rapid antidepressant effects and to be effective in many patients with treatment resistant depression.

US clinics increasingly offer IV infusions of ketamine off label, and in March esketamine, a nasal ketamine based drug, was approved by the US Food and Drug Administration for treatment resistant depression,1 at a cost of £32 400 (€36 060; $40 615) per patient per year.

Carlos Zarate, chief of the Experimental Therapeutics and Pathophysiology Branch at the US National Institute of Mental Health, who has been a key figure in the discovery and evaluation of ketamine as an antidepressant, said that one of the main problems with current antidepressants was their speed of onset in terms of antidepressant and anti-suicidal effects.

He explained that it took 10-14 weeks to see significant improvement with monoaminergic based antidepressants. “In my mind that is too slow,” he said. “We are focusing on treatments that can produce results within hours. That is where we are heading with the next generation of antidepressant, and ketamine is now the prototype for future generation antidepressants which will have rapid, robust antidepressant effects—rapid within a few hours.”

Efficacy and tolerability

Zarate said that, besides correcting chemical imbalances of serotonin and norepinephrine, the new generation of ketamine based antidepressants had other effects such as enhancing plasticity and restoring the synapses and dendrite circuits that shrivel in depression.

When ketamine is given to patients it binds to the N-methyl-D-aspartate (NMDA) receptor, causing a series of transient side effects including decreased awareness of the environment, vivid dreams, and problems in communicating. But the half life of ketamine is only two to three hours, so these side effects quickly subside, whereas the therapeutic effects of the drug last seven days or longer.

Zarate’s team is now focusing on the 24 metabolites of ketamine to hone the drug’s efficacy and tolerability. One of these, hydroxynorketamine, has already been shown to have similar antidepressive effects to ketamine in animals, without the side effects, and it is due to be tested in patients this autumn.

“Ketamine may actually be a prodrug for hydroxynorketamine,” said Zarate.

High cost

A few dozen patients with treatment resistant depression have been treated with ketamine in UK trials, and the European Medicines Agency and the Medicines and Healthcare Products Regulatory Agency are due to reach a decision on authorising esketamine for marketing in October. If the drug is approved private clinics will be able to provide it. But it would be unlikely to be available through the NHS until at least 2020, if at all, as the National Institute for Health and Care Excellence would need to deem it cost effective.

Rupert McShane, consultant psychiatrist and associate professor at the University of Oxford, said that, as well as the likely high cost of esketamine, patients treated with it must be observed in a clinic for two hours after each administration. This would require substantial clinical time, as esketamine is given twice a week for the first month, once a week for the second month, and once a week or once a fortnight from then on.

McShane also recommended that, if approved, a multidrug registry should be set up to monitor the long term safety and effectiveness of ketamine based drugs. Patients would be asked to input their use of any prescribed ketamine, esketamine, or any other future ketamine based product, as well as any self medication with illicit ketamine.

References


    1. Silberner J
    . Ketamine should be available for treatment resistant depression, says FDA panel. BMJ2019;364:l858.doi:10.1136/bmj.l858 pmid:30796014FREE Full TextGoogle Scholar

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Long known as a party drug, ketamine now used for depression, but concerns remain

What Makes the Ketamine-Based Drug for Depression So Different?

On Tuesday (March 5), the U.S. Food and Drug Administration (FDA) approved a ketamine-like nasal spray for patients with depression who haven’t responded to other treatments.

But what makes this newly approved treatment so different?

The drug, called Spravato and made by Janssen Pharmaceuticals, contains the active ingredient esketamine. This substance has the same molecular formula as ketamine but a different chemical structure. (In other words, it contains the same type and number of elements but in a different configuration.) Ketamine is typically used as an anesthetic, but it’s also been used as an illicit party drug.

One reason experts are excited about the nasal spray is that its effects can be seen within several hours to days. Other antidepressants, meanwhile, can take weeks to start working

Antidepressants work by regrowing brain cells and the connections between them, and ketamine appears to have the same effects, said David Olson, an assistant professor of chemistry, biochemistry and molecular medicine at the University of California, Davis. But, these effects likely start much sooner than with other antidepressants, he said.

Still, it’s not entirely clear how the drug works.

Ketamine-like drugs are “dirty”, meaning they likely hit a variety of targets in the brain, Olson told Live Science. “There are a lot of very interesting hypotheses out there, [and] many of them are probably partially valid.”

One idea is that ketamine treats depression by blocking a neurotransmitter called glutamate from binding to the NMDA receptor, and stopping signals from cascading across the brain, Dr. Alan Schatzberg, a professor of psychiatry and behavioral sciences at the Stanford University School of Medicine, told Live Science.

Glutamate is a chemical that brain cells use to send signals to other brain cells. But high levels of it can cause over-excitement in the brain, which can, in turn, damage brain cells.

A more controversial idea is that ketamine binds to opioid receptors, causing a release of naturally occurring opioids in the body. Schatzberg and his team published a small study on this last summer in which they gave patients with depression ketamine twice — once after receiving an opioid-blocking drug, and once after receiving a placebo in place of the opioid blocker. The two treatments took place about a month apart, and neither the participants nor the researchers knew whether patients received the opioid blocker or the placebo. The study found that the patients responded well to the ketamine treatment if they didn’t receive the opioid-blocking drug, but ketamine had no effect on those that did, suggesting an opioid-like role.

This hypothesis has some experts concerned about ketamine-based drugs as a depression treatment.

“My concern about this compound is that it is a disguised form of opiates,” said Dr. Mark George, a distinguished professor of psychiatry, radiology and neurosciences at the Medical University of South Carolina. While George said he is “overjoyed” for the prospect of a new treatment option, “I’m alarmed that there is pretty clear evidence [that] the way ketamine works is through the opioid system.”

If this is the mechanism that ketamine acts through to treat depression, its effects won’t last and people might develop a tolerance to the drug, possibly even becoming addicted, George told Live Science. But if its antidepressant effects come from other mechanisms, such as blocking the NMDA receptor, then “that’s good,” he said.

Olson, however, said that he is less convinced by the opioid hypothesis and thinks more work needs to be done before ringing the alarm bells.

What’s more, the new drug will see limited use. The medication comes with a risk of sedation and dissociation, such as difficulty with judgment, attention and thinking. Because of that, the nasal spray was approved to be used only under a “restricted distribution system,” according to a statement from the FDA.

This means that only patients with severe depression who haven’t responded to at least two antidepressant treatments can receive the drug. In addition, the treatment is administered only in doctor’s offices, and patients must stay in the office and be monitored for several hours after receiving the treatment.

Ultimately, despite some potential problems with the newly approved drug, experts are hopeful it will come through strong.

“I think that the FDA approval of ketamine is a huge landmark in the history of treating neuropsychiatric diseases,” Olson said. “Ketamine really represents a leap forward in terms of new ideas for attacking depression and related neuropsychiatric diseases.”