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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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