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How long does benadryl last?

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Benadryl Allergy/Sinus Headache medicine can last up to 12 hours in your body. Read the instructions carefully before using it. Any comments?

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Currently there are "8 comments" on this Question:

  1. Marisol says:

    [ Marketed under brand name Benadryl; Alleran ]; Night-time Its effects will last approximately 4 to 8 hours. Almost all of the How Long Will it Work: 4-6 hours

  2. Margorie says:

    unfortunately up to 10 hours :( next time try loratidine or cetirazine, they are non-drowsy/less drowsy

  3. Isaura says:

    Can I use Benadryl Itch Stopping my feet (about 100 between both feet a Gel and Benadryl Allergy Oral? I have an insane amount Tablets at the same time of flea bites mostly on

  4. Karmen says:

    Officials at the Federal Trade Commission (FTC) say the 12- to 14-year patent-protection period given to biologic medications is too long to "promote innovation" in the development of these types of drugs. Biotechnology medicines (including… More:http://www.healthcentral.com/allergy/h/how-long-does-generic-benadryl-648-last.html

  5. Avelina says:

    A first time Diphenhydramine (Benadryl) high will last around 2 hours. More:http://www.chacha.com/question/how-long-does-a-benadryl-aka-diphenhydramine-high-last

  6. Shanae says:

    The standard dose is 2 and can be repeated every 4 hours. I take 1 when I am doing something that I need to be alert for. It can make you sleepy.

  7. Bula says:

    Other possible side effects of taking Benadryl can include upset stomach, use Benadryl daily see their doctor because if the symptoms last more than 10 days Detail:http://www.ehow.com/about_5512682_side-effects-longterm-benadryl-use.html

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