GW Pharma Marijuana Drug Confirms Seizure Benefit in Second Pivotal Trial

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GW Pharmaceuticals (GWPH) announced positive results Monday from a second, pivotal clinical trial involving children with a severe form of epilepsy treated with its experimental marijuana-based drug.

Shares of GW Pharma are up 16% to $96.52 in Monday pre-market trading.

In the phase III study, treatment with the GW Pharma drug epidiolex resulted in a 44% reduction in monthly drop seizures compared to a 22% reduction for placebo. The difference was statistically significant.

The study enrolled 171 children (average age: 15) with Lennox-Gastaut Syndrome. Despite taking an average of three medicines to reduce seizures, the patients were still having a median of 74 drop seizures per month. The study added Epidiolex or placebo on top of the patients' other anti-seizure medicines.

Diarrhea, sleepiness, decreased appetite, fever and vomiting were the most common adverse events reported in the study, although a majority were mild to moderate. Twenty patients on epidiolex...

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