A 22-year-old female asked:
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I was wondering: if Benadryl (diphenhydramine) only works for 4 hours and it also causes drowsiness, why people use it during the day? That seems dangerous...

1 doctor answer
Dr. Derrick Lonsdale
72 years experience in Preventive Medicine
Yes, it is: The trouble is that almost any drug has a variable effects from person to person. Some people can get away with using it for their symptoms without becoming drowsy. If you experience drowsiness from the use of this drug, it should not be taken in daytime
Answered on Dec 4, 2014
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Related questions:

A 40-year-old member asked:
Dr. James Ferguson
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Enters the brain: The molecular structure of benedryl allows it to enter the brain where it can interfere with the chemicals that transfer messages between brain cells. ... Read More
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7 thanks
A 50-year-old member asked:
Dr. Michael Summers
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Very unlikely: Unless you are covering a large area for an extended period of time or areas with breaks in the skin, it's highly unlikely this would be absorbed syst ... Read More
A 29-year-old female asked:
Dr. Nayla Mumneh
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Hives: Non drowsy antihistamines like Allegra (fexofenadine) can help, not usre if it is food that is causing your symptoms if they are persistent, you may w ... Read More
A 30-year-old male asked:
Dr. William Lizarraga
15 years experience in Internal Medicine
Not entirely known: But you're describing a very real phenomenon. The same can happen with pain medicines and other sedatives too.

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