This medication is given by injection into a vein or into a muscle as directed by your doctor. The dosage is based on your medical condition and response to treatment. Do not use this medication ...

Medically reviewed by Daniel Combs, MD Benadryl (diphenhydramine) is an over-the-counter (OTC) antihistamine commonly used to treat allergies that is also sometimes used as a sleep aid for insomnia.

This medication is given by injection into a vein or into a muscle as directed by your doctor. The dosage is based on your medical condition and response to treatment. Do not use this medication ...

Adults and children 12 years and older 1 to 2 tablets Every 4 to 6 hours Children 6 to under 12 years 1 tablet or 5 mL to 10 ...