Diphenhydramine Side Effects, How it Works, Upsides & Downsides

Diphenhydramine is an antihistamine and is used for relieving the symptoms of various diseases like the common cold, hay fever, and allergies such as sneezing, itchy nose or eyes, cough, and runny nose. Other uses also include treating dizziness, vomiting, and nausea due to motion sickness and helping you to fall asleep.


Diphenhydramine blocks histamine, a chemical substance that body produces during allergic reactions. Meanwhile, it is effective for drying symptoms like a runny nose and watery nose as it also blocks acetylcholine produced by the body.

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