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Average User Review Score
* Based on 766 reviews from across the web.

Benadryl is a brand name for a number of different medications. In the United States and Canada, it contains the antihistamine diphenhydramine. In the United Kingdom, it contains either the antihistamine acrivastine (marketed as Benadryl Allergy Relief) or the long acting antihistamine cetirizine (marketed as Benadryl One a Day Relief). Benadryl products are marketed in Australia and New Zealand as a cough medicine and do not contain any antihistamine.

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* Extracted from FDA Adverse Event Reports for all drugs with the same active ingredients.

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Druginformer Identified Side Effects: Pain

Posted By Anonymous in askapatient.com on July 25, 2015 @ 12:00 am

... I have hives and have been taking benadryl for the itching. My doc said it was fine to take as much as needed. I have been taking 8 to 9 a day for 6 weeks and my stomach has been hurting non stop for...

Druginformer Identified Side Effects: Headache, Polyuria, Nausea, Abdominal discomfort, Anxiety, Cardiac flutter, Paraesthesia, Scar

Posted By Anonymous in askapatient.com on July 16, 2015 @ 12:00 am

Side Effects: Head tingling, anxiety, heart racing, face pressure, sick stomach, nausea, head pressure, frequent urination I had an allergic reaction to a bug bite, went to hospital and the...

Druginformer Identified Side Effects: Lethargy, Tremor, Dizziness, Hypoaesthesia, Anxiety, Cardiac flutter, Appetite disorder

Posted By Anonymous in askapatient.com on July 11, 2015 @ 12:00 am

... my whole body, dizziness, and my heart raced. Scariest thing that's ever happened to me and I will never take this again. It's been 24 hours and I still feel numb and out of it. Would not re...

Druginformer Identified Side Effects: Somnolence

Posted By Anonymous in askapatient.com on July 10, 2015 @ 12:00 am

Side Effects: None other than occasional delay/absence of causing sleepiness. This has been a miracle drug for my anxiety issues. The doctors tried me on many prescription drugs and all of ...

Druginformer Identified Side Effects: Dizziness, Feeling jittery, Tinnitus, Diarrhoea

Posted By Anonymous in askapatient.com on July 3, 2015 @ 12:00 am

Side Effects: Dizzy, ringing in ears, jittery, diarrhea, This stuff is TOXIC. I took it 3 days ago and the side effects are still here. I want to feel normal again.

Druginformer Identified Side Effects: Chest discomfort, Agitation, Myocardial infarction, Anxiety, Cardiac flutter, Dyspnoea, Somnolence

Posted By Anonymous in askapatient.com on July 2, 2015 @ 12:00 am

Side Effects: Drowsiness, heart palpitations, severe anxiety, tightness in chest, breathlessness NEVER AGAIN...... I took the Benadryl one a day tablets for 3 days for hayfever. By day 3 I ...

Druginformer Identified Side Effects: None

Posted By Proemed in fdb.rxlist.com on June 27, 2015 @ 12:00 am

The makers of this drug clearly warn that this drug is NOT intended to treat chronic insomnia. I actually measured its effectiveness. Turns out that Benadryl actually made my chronic insomnia worse vs...

Druginformer Identified Side Effects: Hallucination

Posted By Anonymous in askapatient.com on June 26, 2015 @ 12:00 am

Side Effects: When you trip for 4 days off benadryl and don't take it you have several hallucinations but they are horrible and dark bad hallucinations I got the worst and most terrifying trip of my ...

Druginformer Identified Side Effects: Feeling cold, Anxiety, Rhinorrhoea

Posted By Anonymous in askapatient.com on June 4, 2015 @ 12:00 am

Side Effects: I wanted to be able to sleep without waking up feeling awful since i have a cold and runny nose. I'm 24 weeks pregnant and an hour after I took the medicine i couldn't stay still, feeli...

Druginformer Identified Side Effects: Somnolence

Posted By Anonymous in askapatient.com on May 29, 2015 @ 12:00 am

Side Effects: Sleepiness (GOOD SIDE EFFECT) God didn't turn water into wine, he turned it into Benadryl. This is the best drug ever. Allergies? Benadryl. Can't sleep? Benadryl. Motion sickn...

* Warning: The facts and figures contained in these reports are accurate to the best of our capability; however, our metrics are only meant to augment your medical knowledge, and should never be used as the sole basis for selecting a new medication. As with any medical decision, be sure to work with your doctor to ensure the best choices are made for your condition.

* About FAERS: The FDA Adverse Event Reporting System (FAERS) is used by FDA for activities such as looking for new safety concerns that might be related to a marketed product, evaluating a manufacturer's compliance to reporting regulations and responding to outside requests for information. Reporting of adverse events is a voluntary process, and not every report is sent to FDA and entered into FAERS. The FAERS database may contain duplicate reports, the report quality is variable, and many factors may influence reporting (e.g., media attention, length of time a drug is marketed, market share). For these reasons, FAERS case reports cannot be used to calculate incidence or estimates of risk for a particular product or compare risks between products.