Over-the-counter sleep aids contain an antihistamine drug that uses the drug's side effect of drowsiness as the therapeutic effect to induce sleep.

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This is a true statement. The antihistamine drug used in over-the-counter sleep aids is often diphenhydramine or doxylamine, which can cause drowsiness as a side effect. The drug's ability to induce drowsiness is used as the therapeutic effect to help people fall asleep.

Over-The-Counter Sleep Aids Contain an Antihistamine Drug That Uses the Drug's