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Doctor insights on: Benadryl Allergy

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How long does Benadryl (diphenhydramine) allergy stay in the body?

How long does Benadryl (diphenhydramine) allergy stay in the body?

A long time: The half life is 8 hours. Assuming that after 4 half lives it is eassentially gone it would take upwards of 32 hours to be eliminated. ...Read more

Dr. John Chiu
2,479 doctors shared insights

Allergies (Definition)

Allergies occur when your immune system is triggered by envirionmental factors it should ignore--for example, pollen in the air, or dander on a cat or dog--and creates cells to fight against them. An allergic reaction typically causes itching, congestion, or drainage, and ...Read more


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What would happen if I took extra Benadryl (diphenhydramine) allergy pills?

What would happen if I took  extra Benadryl (diphenhydramine) allergy pills?

Perhaps, one: See prior answer for details about benadryl (diphenhydramine). An over the counter dose is 25 mg (the same dose they put in many 'sleep aides' like tylenol-pm, where the side effect of Benadryl (diphenhydramine) of drowsiness is the main ingredient). If taking it for typical allergies (runny nose, watery eyes, sneezing), could try one tablet. But there are better ones today with less side effects (zyrtec, allegra, claritin, etc). ...Read more

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31 days late for period, no pregnancy symptom, frequent unrinating and negative test.On Benadryl (diphenhydramine) for allergies.Pls help so confuse and frustrated .Thank

31 days late for period, no pregnancy symptom, frequent unrinating and negative test.On Benadryl (diphenhydramine) for allergies.Pls help so confuse and frustrated .Thank

Not pregnant: If you are not pregnant, missing a period usually results from a failure to ovulate during your last cycle. There can be many reasons for this, including stress, illness, etc. If your periods were always regular before, you should return to normal menses over the next month or two without any treatment. ...Read more

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Is it ok to take Benadryl (diphenhydramine) to treat my allergies? I've tried zyrtec and Claritin but they don't work.

Is it ok to take Benadryl (diphenhydramine) to treat my allergies? I've tried zyrtec and Claritin but they don't work.

Most likely: If you're sure you have allergies (presumably you're referring to pollen, etc) and aren't allergic to any of the ingredients in brand name Benadryl or generic diphenhydramine, then sure, it's worth a try. But beware that Diphenhydramine may cause drowsiness & sleepiness as well as dry eyes, dry mouth, urinary retention & constipation. It's used in some otc to help induce sleep. ...Read more

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What is the limit of Benadryl (diphenhydramine) allergy pills you should take as an adult?

What is the limit of Benadryl (diphenhydramine) allergy pills you should take as an adult?

1-2 every 4-6 hrs: Benadryl (diphenhydramine) is an antihistamine used in the treatment of allergies. It doesn't work long so it has to be taken often. The recommended dose is 1 or 2 pills (each 25 mg) every 4-6 hours, so a maximum of 12 per day (300 mg/day). Taking any Benadryl can cause sleepiness, headaches, dry mouth, & difficulty urinating. Excess Benadryl can cause delirium, diarrhea, seizures, and even coma. ...Read more

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My husband has had a large glass of red wine. Without thinking, has taken 2 Benadryl (diphenhydramine) allergy tablets. As a one off -- is this ok??

My husband has had a large glass of red wine.  Without thinking, has taken 2 Benadryl (diphenhydramine) allergy tablets.  As a one off -- is this ok??

Don't drive: For sure don't let him drive or operate machinery. The effects may be felt next day but not likely to cause significant harm by itself if he is otherwise healthy. ...Read more

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Do antihistamines like Benadryl (diphenhydramine) help prevent oral allergy syndrome?

Do antihistamines like Benadryl (diphenhydramine) help prevent oral allergy syndrome?

Probably not: Oral allergy syndrome is usually caused by pollens and sometimes nuts. Claritin, zyrtec and Allegra (fexofenadine) can help with pollen allergies. But like any other allergy, it is best to stay away from the problem. Have an allergist test you and see what treatment would be best. ...Read more

Benadryl (Definition)

Diphenhydramine is a sedating antihistamine which is a kind of antihistamine type drug (common ...Read more


Dr. John Chiu
1,011 doctors shared insights

Diphenhydramine (Definition)

Diphenhydramine is a sedating antihistamine which is a kind of antihistamine type drug (common ...Read more