First FDA-approved Cannabis-based Drug Now Available In The US

Dr. Orrin Devinsky, director of the Comprehensive Epilepsy Center at NYU Langone Health, served as the lead investigator of two of three phase three clinical trials of Epidiolex.

Your brain on marijuana

Your brain on marijuana 01:39

"In those syndromes, when [Epidiolex] was added to three other seizure [medications], on average, it reduced convulsive seizures -- or 'drop seizures' -- by about 25% to 28% compared to a placebo," Devinsky said. "So I think it's very important to recognize ... that it clearly is effective, and this was statistically significant in all three of the large studies that we did, but by the same token, the effect was modest.

"There are some people who had dramatic improvements. Many had a modest improvement, and some had no improvement. So it's not a miracle drug. It's an effective drug, and I think its side effect profile is quite good compared to other seizure drugs that we have, but it's not a miracle cure," Devinsky said.

The most common side effects of Epidiolex, according to GW Pharmaceuticals, include sleepiness, decreased appetite, diarrhea and an increase in liver enzymes.

Shauna Garris, a pharmacist, pharmacy clinical specialist and adjunct assistant professor at the University of North Carolina's Eshelman School of Pharmacy, said the drug is effective and works somewhere between "fairly" and "very well." She has not used Epidiolex in her own clinical practice and was not involved in the development of the drug but said she's not sure it will live up to "all of the hype" that has surrounded it.

Still, she said the FDA's approval of Epidiolex signals "validation of the science of cannabinoid medication."

GW Pharmaceuticals says the average list price of Epidiolex is $32,500 a year. The company expects that the drug will be covered by most insurance plans and asserts that "this price is in line with other branded, FDA-approved anti-epileptic drugs (AEDs), such as Banzel, and access for eligible patients is expected to be similar to such AEDs for similar indications for LGS (e.g., Onfi and Banzel)."

It is also launching a patient support program "to help patients who have been prescribed Epidiolex gain access to therapy. The program offers patient/caregiver-focused education and resources to help lower out-of-pocket costs or provide product at no cost for eligible patients."

Although Epidiolex is approved only for the treatment of two rare seizure disorders, doctors can now prescribe the medication "off-label" for other conditions. According to the US Department of Health and Human Services, this is both legal and common; one in five of all medications prescribed is for off-label use.

"The off-label use of CBD and Epidiolex will be a fascinating subject to look at over the coming years," Devinsky said. "Many, many patients would like to have access to it who don't fit the criteria, and I believe many doctors will try to prescribe it, as will I for some people who I think have tried many, many medications and for whom it might be beneficial."

He added, "I think doctors are always trying to make those decisions about a good benefit-to-toxicity ratio, and CBD is a fairly attractive compound. The question is, what will the insurance companies do?"

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