Stop taking diphenhydramine and seek emergency medical attention if you experience an allergic reaction (difficulty breathing, closing of your throat, swelling of your lips, tongue, or face, or hives).

Other, less serious side effects may be more likely to occur. Continue to take diphenhydramine and talk to your doctor if you experience:

sleepiness, fatigue, or dizziness
headache
dry mouth
difficulty urinating or an enlarged prostate


Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.

 

FDA Information

Why is this medication prescribed?

Other uses for this medicine

Dosage and using this medicine

What special precautions should I follow?

What should I do if I forget a dose?

What storage conditions are needed for this medicine?

In case of an emergency/overdose