Complete drug elimination occurs after how many hours, if t½ is 4 hrs______________?
Correct answer: B. 20 hrs
- A. 12 hrs
- B. 20 hrs
- C. 25 hrs
- D. 30 hrs
Explanation
After five half-lives, about 97% of a drug has been eliminated and this is conventionally treated as complete elimination. With a 4-hour half-life, five half-lives require 20 hours, although a drug is never mathematically reduced to exactly zero.
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