A 500 mg tablet has a half life of 4 hours. After 4 hours the amount left is:
A125 mg
B500 mg
C750 mg
D250 mg
Answer & Solution
Correct answer: D. 250 mg
1. One half life halves the amount.
2. Half of 500 is 250.
3. So 250 mg remains.
_Source: OpenStax Pharmacology for Nurses, Chapter 2, Drug Administration and Pharmacokinetics._
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