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A 18-year-old female asked:

Take antihistamine pills (aerius) right before workout to avoid excessive redness? or should you take them in the morning or at night bc last a day.

1 doctor answer1 doctor weighed in
Dr. John Chiu
Allergy and Immunology 58 years experience
Anytime: Although there had been study suggesting antihistamine was more effective when taken in the evening, in practice I have not seen much difference as long as you take it. In your case, taking an antihistamine about 2 hrs before exercise may make sense.
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Last updated May 2, 2016


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