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A 23-year-old male asked:

Is it safe to take another 24-hour zyrtec (cetirizine) antihistamine if there's still about 8 hours left before the previous one wears off?

2 doctor answers2 doctors weighed in
Dr. Oscar Novick
Pediatrics 58 years experience
Zyrtec (cetirizine): You can take another xyrtec but you may become very sleepy.
Dr. William Culviner
ENT and Head and Neck Surgery 30 years experience
Follow dosing: It's best to adhere to the dosing recommended. It would be hard to overdo it with the zyrtec (cetirizine) , the way you are suggesting, but it begs the question- how well does the rx work , if you want more before the proper dosing interval ? I would think you need to talk with your doctor about other options to achieve safe allergy control. Sometimes more than one rx is necessary.

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Last updated Feb 23, 2014

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