The nurse reviewing the medication history of the client taking dapsone would have concern if which drug were listed?
1. Potassium
2. Aspirin
3. Viagra
4. St. John's wort
Correct Answer: 4
Rationale 1: Potassium does not cause adverse effects with dapsone.
Rationale 2: Aspirin does not cause adverse effects with dapsone.
Rationale 3: Viagra does not cause adverse effects with dapsone.
Rationale 4: St. John's wort can decrease levels of dapsone.
Global Rationale: Dapsone levels may be decreased by St. John's wort. The other drugs do not have a listed drug–drug interaction with dapsone.
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