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drug medical definition
noun
- A substance used in the diagnosis, treatment, or prevention of a disease or as a component of a medication.
- Such a substance as recognized or defined by the US Food and Drug Administration.
- A chemical substance, such as a narcotic or hallucinogen, that affects the central nervous system, causing changes in behavior and often addiction.
- To administer a drug, especially in an overly large quantity, to an individual.
- To stupefy or dull with or as if with a drug; to narcotize.
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