The FDA has approved GW Pharmaceuticals’ Epidiolex (cannabidiol) oral solution for the treatment of seizures associated with two rare and severe forms of epilepsy, Lennox-Gastaut syndrome and Dravet syndrome. This is the first FDA-approved drug that contains a purified drug substance derived from marijuana. It is also the first FDA approval of a drug for the treatment of patients with Dravet syndrome.    CBD is a chemical component of the Cannabis sativa plant. However, CBD does not cause into...