Which term describes the tissue where a drug exerts its action?

• A. Site of Administration
• B. Site of Absorption
• C. Site of Action
• D. Site of Elimination

Answer: (C)

The tissue where a drug produces its effect is the site of action. This is the location where the drug interacts with its molecular target—such as a receptor, enzyme, or ion channel—and triggers the pharmacological response. The site of action is about where the intended effect happens, not where the drug is given or how it leaves the body. For example, a drug may be taken by mouth (site of administration) or applied to the skin, but its action occurs at the target tissues where it binds. Similarly, absorption refers to how the drug enters the bloodstream, and elimination refers to how it is removed from the body. A drug’s effect is best described by the site of action because that’s where the therapeutic or adverse response is produced.