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A 37-year-old member asked:

side effects of benadryl (diphenhydramine)?

2 doctor answers7 doctors weighed in
Dr. Peter Kurzweil
Internal Medicine 50 years experience
Dried up and sleepy: Why would you want to take benadry (the brand name for diphenhydramine) long term? Fagetaboutit. Side effects are drying of mucous membrane, drowsiness, fatigue, difficulty urinating...
Dr. Gena Kluwe
Internal Medicine 31 years experience
Most common side: Effects of Diphenhydramine are drowsiness, dry mouth, constipation, blurry vision, thickenened secretions, impaired coordination. There is a big laundry list of the usual anti choline this side effects, but those are the most common. People use it to sleep or for itching most often.

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A 29-year-old member asked:

Strange side effects of benadryl (diphenhydramine)?

1 doctor answer3 doctors weighed in
Dr. Lee Perry
Allergy and Immunology 17 years experience
Several: The most common side effect of taking too much Benadryl (diphenhydramine) would be excessive drowsiness. Other possible side effects include dizziness, headache, constipation, urinary retention, and heart palpitations.
A 36-year-old member asked:

What are the side effects of taking too much benadryl (diphenhydramine)?

1 doctor answer2 doctors weighed in
Dr. Lee Perry
Allergy and Immunology 17 years experience
Several: The most common side effect of taking too much Benadryl (diphenhydramine) would be excessive drowsiness. Other possible side effects include dizziness, headache, constipation, urinary retention, and heart palpitations.
A 45-year-old member asked:

Will taking a Benadryl (diphenhydramine) every so often creat any sexual side effects that last months?

1 doctor answer2 doctors weighed in
Dr. Tracy Sinha
Allergy and Immunology 53 years experience
Not months: Depands dose , drowsy and sleepy so--nofun for sex, would last 6==8 hrs.
Columbus, IN
A 20-year-old male asked:

Can stopping Benadryl (diphenhydramine) after extended use cause side effects?

1 doctor answer1 doctor weighed in
Dr. Ronald Krauser
A Verified Doctoranswered
A US doctor answeredLearn more
Not usually: It should not cause any issues.
A 46-year-old member asked:

How long does Benadryl (diphenhydramine) side effects last?

1 doctor answer2 doctors weighed in
Dr. John Chiu
Allergy and Immunology 57 years experience
Less than 12 hrs: Likely from 6 to 12 hrs.

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Last updated May 28, 2019
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