The Food and Drug Administration announced Monday that it has approved a prescription cannabis-based medicine — a purified form of the drug cannabidiol, which doesn't produce a high — to treat severe forms of epilepsy in patients two and older.

Why it matters: This is the first FDA-approved cannabis-based drug to hit the market. Meanwhile, commissioner Dr. Scott Gottlieb cautioned in a statement: "This is an important medical advance. But it’s also important to note that this is not an approval of marijuana or all of its components."