Pharmacology · single question
What is the half-life of methamphetamine when administered intravenously?
Show answer and explanation
Correct answer: D. 9-12 hours
- A. 16-20 hours overestimates the methamphetamine half-life.
- B. 24-36 hours is far too long — this would apply to drugs like amiodarone.
- C. 3-5 hours is too short for methamphetamine's half-life.
- D. Correct. Methamphetamine has a half-life of approximately 9-12 hours (IV route). Oral and intranasal routes have similar half-lives (~9h). Smoked routes are slightly longer (~12h). This long half-life contributes to its prolonged stimulant effects.