Which term describes the effect of the drug on the body and the effect of the body on the drug?

• A. Pharmacology
• B. Pharmacokinetics
• C. Pharmacodynamics
• D. Controlled substance

Answer: (A)

Pharmacology is the study of how drugs interact with living systems, covering both how the body handles a drug and how the drug affects the body. It includes two main subareas: pharmacokinetics, which looks at what the body does to the drug (absorption, distribution, metabolism, and excretion), and pharmacodynamics, which looks at what the drug does to the body (mechanism of action, receptor interactions, and dose-response effects). Since the description involves both the drug’s effects on the body and the body’s effects on the drug, pharmacology is the best-fit term. Pharmacokinetics and pharmacodynamics describe one side each, and a controlled substance is simply a regulatory category, not a descriptor of drug action.