What is the drug salvia made from?

The drug commonly known as "salvia" is made from the (usually dried) foliage of the plant Salvia divinorum, a member of the sage family. Sometimes, the active substances of the plant (Salvinorins, particularly Salvinorin A), are extracted and reapplied to another batch of leaves, creating a concentrated form of the drug. These are commonly referred to as extracts.