Which statement accurately describes ADME in pharmacokinetics?

• A. It refers to the study of the time course of a drug's effects on the body
• B. It stands for Absorption, Distribution, Metabolism, Excretion
• C. It describes the mechanism of action of a drug at the target site
• D. It relates to the chemical synthesis of drugs

Answer: (B)

Understanding what ADME means is key. ADME describes the four processes that govern a drug’s fate in the body: Absorption into the bloodstream, Distribution to tissues, Metabolism (biotransformation), and Excretion (elimination). Together, these steps determine how much drug reaches systemic circulation, where it goes, how it’s transformed, and how it’s removed, shaping the drug’s exposure, onset, and duration.

The other statements relate to different concepts. Describing the time course of a drug’s effects on the body is about pharmacodynamics, not ADME. Explaining the mechanism of action at the target site also falls under pharmacodynamics. The chemical synthesis of drugs is part of drug development chemistry, not pharmacokinetics.