Some governments define the term drug by law. In the United States, the Federal Food, Drug, and Cosmetic Act definition of "drug" includes "articles intended for use in the diagnosis, cure, mitigation, treatment, or prevention of disease in man or other animals" and "articles (other than food) intended to affect the structure or any function of the body of man or other animals." Consistent with that definition, the U.S. separately defines narcotic drugs and controlled substances, which may include non-drugs, and explicitly excludes tobacco, caffeine and alcoholic beverages.
The use of drugs, the possession or distribution of which is unlawful under the Controlled Substances Act. Such term does not include the use of a drug taken under supervision by a licensed health care professional, or other uses authorized by the Controlled Substances Act or other provisions of Federal law. 29 USC
1. A substance used in the diagnosis, treatment, or prevention of a disease or as a component of a medication.
2. Such a substance as recognized or defined by the US Food and Drug Administration.
3. A chemical substance, such as a narcotic or hallucinogen, that affects the central nervous system, causing changes in behavior and often addiction.
4. To administer a drug, especially in an overly large quantity, to an individual.
5. To stupefy or dull with or as if with a drug to narcotize.