Intravenous ketamine shows promise as a therapy for hard-to-treat depression, but there’s a caveat, according to an author of a new study that compared it to electroconvulsive therapy. Since IV ketamine is a generic medication more typically used as an anesthetic, “no organization or drug company is going to spend millions of dollars to get FDA approval for it,” said Amit Anand, lead study author and psychiatry professor at Harvard Medical School and physician at Mass General Brigham. “There’s no money in generic medication.” Some clinics offer Spravato, a nasal-delivery version of a ketamine-like drug that some insurers cover. Off-label IV ketamine, also prescribed at clinics, isn't covered. Cost considerations: Seeing patients get “fleeced” at ketamine clinics was partly why Anand wrote the grant to study generic IV ketamine for treatment-resistant depression, he told Erin. “If you have a large study done, maybe third-party payers will start paying for intravenous ketamine and patients won’t have to pay out of pocket.” Patients are considered to have treatment-resistant depression if they have tried at least two depression treatments without their symptoms improving. In the head-to-head study, published in the New England Journal of Medicine, Anand and his colleagues gave IV ketamine to 195 patients with treatment-resistant depression. Their symptoms improved as much as those who received electroconvulsive therapy, a more traditional treatment, in which doctors send electric currents through a patient's brain while they're under anesthesia. Six months later, both groups reported similar improvements in quality-of-life scores. The percentage of patients who had muscle pain or weakness after treatment was higher in the ECT group, while patients in the ketamine group were more likely to have dissociative symptoms. What’s next? A next step for the research, Anand said, is a larger study of more than 1,000 patients over the next six years of ketamine vs. ECT for acutely suicidal patients. Nearly 40 percent of participants in the NEJM study had previously attempted suicide. “Antidepressants take four to six weeks,” Anand said. “ECT works very fast. So for an urgent situation, like if somebody is acutely suicidal or acutely psychotic or acutely not eating or drinking, you have to get them better.” Given what he’s seen so far, Anand believes ketamine might work as fast as ECT in critical situations, or perhaps even faster.
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