Definition of Drug

 

 

Definition of Drug: A drug is a chemical that has medicinal, performance-enhancing or intoxicating effects when introduced into the body of a human or other animal. Substances which are foods are not considered to be drugs, although active ingredients from foods make are purified for use as drugs. Also, some chemicals used as drugs are identical to substances made in the body (e.g., insulin, testosterone). The chemical is considered a drug only if it is introduced into the body from the outside, such as by ingestion, injection or topical application.