Drug

Definition

A drug is any substance that, when taken into the body, alters its structure or function. Drugs can be prescribed for medical purposes, used recreationally, or abused.

Related terms

Tolerance:

Tolerance refers to a reduced response to a drug over time, requiring higher doses to achieve the same effect. It is often seen with chronic drug use.

Addiction:

Addiction is a psychological and physiological dependence on a substance or behavior. It involves compulsive drug-seeking and use despite negative consequences.

Pharmacology: Pharmacology is the study of how drugs interact with biological systems, including their effects, mechanisms of action, and therapeutic uses.