Which drug has a shorter half-life and clears from the body more quickly?

Which drug has a shorter half-life and clears from the body more quickly?

• A. Apixaban
• B. Warfarin
• C. Heparin
• D. Dabigatran

Answer: (A)

Understanding half-life helps you predict how long a drug stays active after you stop it. A shorter half-life means the drug clears from the body more quickly, so its effects wear off sooner. Apixaban has about a 12-hour half-life in healthy adults and is cleared mainly by the liver with a relatively predictable, lower reliance on the kidneys. This gives a quicker offset after stopping the drug compared with warfarin, which has a much longer half-life (around 40 hours) and thus a longer time before its effects wane. Dabigatran’s half-life is somewhat longer (about 12–17 hours) and more affected by kidney function, so its clearance can be slower in some patients. Heparin has a very short half-life (roughly 1–2 hours) when given IV, but its use is typically acute and in-hospital with different reversal considerations, not long-term therapy. So, apixaban is the best answer here because its shorter half-life relative to warfarin—and generally faster offset than dabigatran—means it clears from the body more quickly.

Understanding half-life helps you predict how long a drug stays active after you stop it. A shorter half-life means the drug clears from the body more quickly, so its effects wear off sooner.

Apixaban has about a 12-hour half-life in healthy adults and is cleared mainly by the liver with a relatively predictable, lower reliance on the kidneys. This gives a quicker offset after stopping the drug compared with warfarin, which has a much longer half-life (around 40 hours) and thus a longer time before its effects wane. Dabigatran’s half-life is somewhat longer (about 12–17 hours) and more affected by kidney function, so its clearance can be slower in some patients. Heparin has a very short half-life (roughly 1–2 hours) when given IV, but its use is typically acute and in-hospital with different reversal considerations, not long-term therapy.

So, apixaban is the best answer here because its shorter half-life relative to warfarin—and generally faster offset than dabigatran—means it clears from the body more quickly.