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Doctor insights on: How Does Benadryl Help Reduce Allergy Symptoms

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How does Benadryl (diphenhydramine) help reduce allergy symptoms?

How does Benadryl (diphenhydramine) help reduce allergy symptoms?

Reduces histamine: It decreases the amount of chemicals, such as histamine( hence it is an antihistamine), an allergic person's body produces in response to allergens, which could be anything from pollen and pet dander to substances which cause skin rashes. ...Read more

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Dr. John Chiu
2,491 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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Could Benadryl (diphenhydramine) help with asthma like allergy symptoms?

Could Benadryl (diphenhydramine) help with asthma like allergy symptoms?

Benadryl (diphenhydramine) is sedating: Claritin, zyrtec, allegra, or Benadryl (diphenhydramine) can help with allergy and asthma symptoms caused by allergies to respiratory pollens or other airborne allergens. One should work with his doctor to see which combination of over-the-counter allergy meds and prescription asthma inhalers/pills work the best. A patient will learn over time, what medicines to add or increase, depending on how "bad" the air is. ...Read more

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Burnig/itchy hives upper body/face x6days in row. Come ad go w/ benadryl (diphenhydramine). No allergies/new foods/detergent ect. Symptom of something else serious?

Burnig/itchy hives upper body/face x6days in row. Come ad go w/ benadryl (diphenhydramine). No allergies/new foods/detergent ect.  Symptom of something else serious?

Possibly: The fact that it is new onset, responds to benadryl, (diphenhydramine) and has sx limited to what you mention still point to some type of allergy to a food/ air borne pollen in bloom. Ask your doctor to use a stronger tx than just Benadryl (diphenhydramine) and if it persists to do an allergy work up. Also make sure you have not been exposed to mites/fleas, bed bugs, etc. ...Read more

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My allergy medicine is not working.I am taking cetrizin HCL antihistamine. I also took benadryl (diphenhydramine) and loratadine tablet but not working. At night time while sleeping feel ok but once you get up and move then symptom comes back.

My allergy medicine is not working.I am taking cetrizin HCL antihistamine. I also took benadryl (diphenhydramine) and loratadine tablet but not working. At night time while sleeping  feel ok but once you get up and move then symptom comes back.

See physician: A 51 year old male with allergy symptoms taking cetirizine, benadryl, (diphenhydramine) and loratadine without improvement. See an allergist to determine what you are allergic to and also to determine if there is something else going on, like a sinus infection. Add a nasal steroid spray (OTC Flonase or Nasacort) twice a day as well. ...Read more

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Is it safe to take Benadryl (diphenhydramine) with cymbacort , I have COPD and mild asthma but am having some allergy symptoms right now?I also use rescue inhaler

Is it safe to take Benadryl (diphenhydramine) with cymbacort , I have COPD and  mild asthma but am having some allergy symptoms right now?I also use rescue inhaler

Yes, but: Benadryl (diphenhydramine) is an excellent antihistamine and works very well. However, the side effects (sedation, visual disturbances, dizziness when standing up to fast can be problematic). There are other antihistamines that have fewer side effects like Claritin which are more likely to not affect other medications you may be using. ...Read more

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I have year round nasal allergies and take zyrtec. One new symptom is itching on the roof of my mouth. Zyrtec and Benadryl (diphenhydramine) don't help. What will?

I have year round nasal allergies and take zyrtec. One new symptom is itching on the roof of my mouth. Zyrtec and Benadryl (diphenhydramine) don't help. What will?

Other choices: Itching of the palate is not an uncommon symptom with allergies. This could be related to pollen-food allergy syndrome such as eating fresh apple (if you are allergic to birch tree), or melons (if you are ragweed allergic), etc. Trying a different antihistamine may help--like fexofenadine (allegra). ...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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Can u take other allergy pill if you have taken benadryl (diphenhydramine)?

Can u take other allergy pill if you have taken benadryl (diphenhydramine)?

Once in a while: Benadryl (diphenhydramine) is sedating allergy pill works for 6 hrs once in a while you can take other allergy pill, why not find out whats causing the problem? ...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