NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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How much elemental iron is in Ferrous sulfate?

  1. 10 mg

  2. 20 mg

  3. 30 mg

  4. 40 mg

The correct answer is: 20 mg

Ferrous sulfate is a commonly used iron supplement. It contains around 20% elemental iron. Therefore, in 100 mg of ferrous sulfate, there is approximately 20 mg of elemental iron. This is why the correct answer is B (20 mg). The other options are incorrect because they do not represent the amount of elemental iron in ferrous sulfate.

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