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Benadryl and Increased Heart Rate: What Users Say

Increased heart rate: mentioned by 3 users (3.8%)

Based on user experiences from 79 Benadryl reviews, the following table shows the most commonly mentioned side effects.

All user comments are moderated by Drugs.com. Each review is verified for relevance and screened for inappropriate content. Side effects are user-reported and not clinically verified.

drowsiness 15.2%
nausea 8.9%
itching 6.3%
heart palpitations 5.1%
shortness of breath 5.1%
swelling 5.1%
allergic reaction 3.8%
anxiety 3.8%
dry mouth 3.8%
increased heart rate 3.8%

Reviews for Benadryl

Showing 3 reviews tagged with "increased heart rate". Clear filters to view all 79 reviews.
Commonly mentioned side effects
  • use...
  • October 28, 2014

For Allergic Reactions "I was given Benadryl at the hospital for an allergic reaction. It instantly shot my heart rate up to 217 bpm, and instantly my mouth got dry. I couldn't swallow, my chest felt hot, like an elephant was sitting on it, and I got really cold. It put me into shock, my body wouldn't stop shaking, I could breathe. It was so scary, I thought I was dead. Thanks to the doctor's quick response, he saved me, but it almost killed me."

8 / 10
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42 Report
  • Ros...
  • Taken for 2 to 5 years
  • November 24, 2021

For Allergic Reactions "So I've been taking this going on 2 years now, and I regret taking it so long. I even ended up in the ER because my heart wouldn't stop racing, it was over 170. I believe it was due to the Benadryl. I ignored the side effect before I noticed that sometimes when I took it, my heart would beat funny, and it would be hard to catch my breath, but I kept taking it as it stopped my itchy throat, eyes, and mouth. Doctors at the ER found arrhythmia but said everything else looked fine. I stopped taking it, haven't taken it in a week, and I'm still having a racing heart and palpitations. Don't take this stuff long term. I'm in my early 20s and healthy if anyone reading this was curious."

6 / 10
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13 Report
  • bru...
  • Taken for less than 1 month
  • October 4, 2021

For Allergic Reactions "It's making my heart race and making me feel so weird, and my sore throat didn't go away, and I still feel bad."

4 / 10
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8 Report

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Reviews may be edited to correct grammar/spelling or remove inappropriate content. Reviews appearing to come from parties with a vested interest are not published. This information is not intended to endorse any medication and should not replace the expertise and judgment of healthcare professionals.