Learn more about Benadryl Side Effects by learning about the individual side effects of Acetaminophen, Diphenhydramine, Phenylephrine which is what Benadryl is made from.
Acetaminophen is a pain reliever and fever reducer.
Diphenhydramine is an antihistamine that reduces the natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose.
Phenylephrine is a decongestant that shrinks blood vessels in the nasal passages. Dilated blood vessels can cause nasal congestion (stuffy nose).
The combination of acetaminophen, diphenhydramine, and phenylephrine is used to treat headache, fever, body aches, runny or stuffy nose, sneezing, itching, watery eyes, and sinus congestion caused by allergies, the common cold, or the flu.
Acetaminophen, diphenhydramine, and phenylephrine may also be used for purposes not listed in this medication guide.
Benadryl Side Effects
- chest pain, rapid pulse, fast or uneven heart rate;
- confusion, hallucinations, severe nervousness;
- tremor, seizure (convulsions);
- easy bruising or bleeding, unusual weakness;
- urinating less than usual or not at all;
- nausea, pain in your upper stomach, itching, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of your skin or eyes); or
- dangerously high blood pressure (severe headache, blurred vision, buzzing in your ears, anxiety, chest pain, shortness of breath, uneven heartbeats, seizure).
Less serious side effects may include:
- dizziness, drowsiness, mild headache;
- dry mouth, nose, or throat;
- blurred vision;
- feeling nervous; or
- sleep problems (insomnia);
- thickening of bronchial secretions