A drug with a long half-life means?

• A. It is rapidly eliminated
• B. The drug may exert its action for a long period of time
• C. It has little effect
• D. It requires ongoing dosing

Answer: (D)

Long half-life means the drug is cleared from the body slowly, so it stays around longer and can continue to produce its effects for an extended period after a dose. This slow elimination often allows dose intervals to be spaced further apart because therapeutic levels are maintained longer. It doesn’t imply the drug has little effect, and it isn’t about rapid elimination. In fact, the longer the half-life, the less frequently dosing may be needed, rather than requiring ongoing dosing.