Canadian Pharmacist Qualifying Exam Practice · Question
A drug has a half-life of 6 hours. If a patient takes a single dose of 100 mg, approximately how much of the drug will remain in the body after 18 hours?
After 1 half-life (6 hours), 50% (50 mg) remains. After 2 half-lives (12 hours), 25% (25 mg) remains. After 3 half-lives (18 hours), 12.5% (12.5 mg) remains.
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Question: A drug has a half-life of 6 hours. If a patient takes a single dose of 100 mg, approximately how much of the drug will remain in the body after 18 hours?
Answer options:
- 50 mg
- 25 mg ✅ 12.5 mg
- 6.25 mg
Correct answer: 12.5 mg
Explanation: After 1 half-life (6 hours), 50% (50 mg) remains. After 2 half-lives (12 hours), 25% (25 mg) remains. After 3 half-lives (18 hours), 12.5% (12.5 mg) remains.
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