As with any medicine, diphenhydramine (Benadryl ®, Sominex ®, and many other brand names) can cause side effects.However, not everyone who takes the medication will have problems. Diphenhydramine (Benadryl, Diphenhist, Unisom, Zzzquil) is an antihistamine used to treat symptoms of seasonal allergies including sneezing, runny nose, and itching or watering eyes.It is also used as an over-the-counter sleep aid.

Diphenhydramine is a first-generation H1 antihistamine that is widely used as a generic, over-the-counter medication to treat allergies. Pfizer U.S. Pharmaceuticals Group, New York, NY.

Diphenhydramine (also known as DPH, Benadryl, and many others) is a deliriant substance of the ethanolamine class. Benadryl can react with a variety of drugs; Drowsiness is a side effect of taking Benadryl for cats …

It is available in generic and brand versions. Common side effects. "Product Information.

[ Ref] 1. Diphenhydramine is used for Allergic Reaction, Rash, Hay Fever etc.

day-time drowsiness or "hangover" feeling after night-time use.

It is used by mouth, injection into a vein, injection into a muscle, or applied to the skin.

Benadryl for Cats: Although cats can take Benadryl, it has potential side effects, including hyperexcitability, diarrhea, decreased appetite and urination, dry mouth, vomiting and sedation.

2. If side effects do occur, in most cases, they are minor and either require no treatment or can easily be treated by you or your healthcare provider. "Product Information.

Talk to your doctor or pharmacist if this side effect bothers you or won’t go away. This happens in more than 1 in 10 people. The CNS depressant effect of diphenhydramine parallels its plasma concentrations. Common and Rare Side Effects for Diphenhydramine Oral. Benadryl Itch Stop Gel Maximum Strength (diphenhydrAMINE topical)." Common diphenhydramine side effects may include: dizziness, drowsiness, loss of coordination; dry mouth, nose, or throat; constipation, upset stomach; dry eyes, blurred vision; or. A Change In Vision. Maximal effect is typically around two hours after a dose, and effects can last for up to seven hours.

An Extreme Sense Of Wellbeing Called Euphoria.

Other common side effects of diphenhydramine happen in more than 1 … When exceeding approved doses, diphenhydramine produces powerful deliriant effects. It can also be used for insomnia, symptoms of the common cold, tremor in parkinsonism, and nausea. The plasma concentration threshold for sedation is 30 to 42 ng/mL, and to … Benadryl Itch Stopping (diphenhydramine-zinc acetate topical)."

In fact, some people tolerate it quite well. The most common side effect of diphenhydramine is feeling sleepy and tired. A Type Of Bumpy Skin Rash Called A Maculopapular Rash. Diphenhydramine is an antihistamine mainly used to treat allergies.

A Skin Rash. No side effects have been reported with the use of diphenhydramine topical. A Feeling Of General Discomfort Called Malaise. Benadryl (diphenhydramine) is a brand-name, over-the-counter product that's typically used to relieve symptoms of hay fever (seasonal allergies), other allergies, and the common cold.

Diphenhydramine is an antihistamine that is used to treat allergies, cold symptoms, and insomnia.

A Change In Vision.

Call your doctor if you experience any unusual problems while you are taking this medication.

A Migraine Headache.

Diphenhydramine may cause other side effects.