Which term describes the process by which a drug or its metabolites are removed from the body?

Which term describes the process by which a drug or its metabolites are removed from the body?

• A. Elimination
• B. First pass effect
• C. Half-life of a drug
• D. Onset of action

Answer: (A)

Removing a drug from the body is described by elimination, which includes both metabolism (biotransformation) and excretion (via kidneys, bile, lungs, etc.). This term captures the overall process by which drug levels decline and the drug is cleared from the system. The first-pass effect refers to metabolism that reduces the amount entering systemic circulation before it can act, affecting bioavailability rather than the clearance after absorption. The half-life describes how long it takes for the drug concentration to fall by half, a measure of the rate of elimination rather than the process itself. The onset of action is the time until therapeutic effects appear, not how the drug is removed. Therefore, elimination best describes the removal from the body.

Removing a drug from the body is described by elimination, which includes both metabolism (biotransformation) and excretion (via kidneys, bile, lungs, etc.). This term captures the overall process by which drug levels decline and the drug is cleared from the system. The first-pass effect refers to metabolism that reduces the amount entering systemic circulation before it can act, affecting bioavailability rather than the clearance after absorption. The half-life describes how long it takes for the drug concentration to fall by half, a measure of the rate of elimination rather than the process itself. The onset of action is the time until therapeutic effects appear, not how the drug is removed. Therefore, elimination best describes the removal from the body.