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A 22-year-old female asked:

Hi. my allergies are killing me! nose won't stop running and i am quite drowsy... been taking zyrtec (cetirizine) regulary for over a month! is it okay to take every 12 hours?

1 doctor answer1 doctor weighed in
Dr. Richard Schneider
Integrative Medicine 47 years experience
Zyrtec (cetirizine): Although on rare occasion Zyrtec (cetirizine) may be taken twice a day, it can cause drowsiness. Check with your PCP for a more effective way to treat your allergies with less side effects.
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Last updated Sep 23, 2019

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