What is the major ingredient in most over-the-counter sleeping pills?

Name: What is the major ingredient in most over-the-counter sleeping pills?
Brand: Quizplus
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Quizplus · Accepted Answer

Antihistamines are the major ingredient in most over-the-counter sleeping pills. They work by blocking histamine, which can cause drowsiness. Aspirin and acetaminophen are pain relievers and PPA (phenylpropanolamine) was a decongestant that has been removed from many products due to safety concerns.

What Is the Major Ingredient in Most Over-The-Counter Sleeping Pills