How Long Does It Take for Benadryl To Work

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How long does it take for benadryl to work?
asked Feb 11, 2010 by anonymous
edited Mar 11, 2013 by nikkilu

5 Answers

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for a 37 yr old how long does it take for benadryl to work
answered Mar 15, 2010 by anonymous
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Between 15-60 minutes
answered Apr 21, 2010 by anonymous
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About 30 mins to an hour. Depending on how much liquid to take the pills with. If its in syrup form, about half an hour.
answered Aug 5, 2010 by anonymous
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I have a severe case of hives possibly caused by medications for bronchittis.  I took 2 tablets of Benadryl liqui-gels.  After 3 hours, I haven't felt much relief.  Does it take a few days, or just more today every 4 to 6 hours to begin to feel some relief?
answered Feb 28, 2011 by anonymous
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Benadryl, or diphenhydramine hydrochloride, when taken by mouth, works within 15 to 60 minutes. When injected through a muscle, it takes 20 to 30 minutes to work. When injected through a vein, it works rapidly. The effects of diphenhydramine hydrochloride work for approximately 4 to 8 hours, regardless of the form in which it is taken.
answered Mar 11, 2013 by nikkilu Diamond Guide (4,302 points)
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