Question

What ingredient in cold medicine makes you tired?
Posted 3 years ago in Cold & Flu by studyNut

Answers

Anonymous
For nighttime cold medications such as NyQuil, the active ingredient known to cause drowsiness is dextromethorphan. In allergy medications, the antihistamine active ingredient/quality interferes with receptors designed to react to allergens, slowing some neurological connections and causing drowsiness.


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