Medicines are classified as

• A. Natural and synthetic
• B. Over-the-counter drugs and prescription drugs
• C. Brand-name and generic
• D. Controlled and non-controlled

Answer: (B)

Medicines are commonly classified by how they are obtained and regulated: over-the-counter versus prescription drugs. Over-the-counter medicines can be bought and used without a prescription because they’re considered safe for general use at labeled doses. Prescription medicines require a clinician’s authorization because they can have more serious side effects, interactions, or require monitoring. The other groupings describe origin (natural vs. synthetic), branding (brand-name vs. generic), or abuse potential (controlled vs. non-controlled) rather than the standard access-and-supervision distinction that governs everyday use. So the best fit is the division between over-the-counter and prescription drugs.