A member asked:

Side effects of using zyrtec (cetirizine) for hives?

2 doctors weighed in across 2 answers

Read PI: All medications that are available have included a package insert that describes what the medication is and its side effects.

Answered 10/18/2012

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Sleepiness: The major side-effect of zyrtec (cetirizine) is sedation - sleepiness, fatigue, and slowed reaction time. This occurs in 1 out of 10 or 1 out of 12 users. Compare to Benadryl (diphenhydramine) 1 of 3 users or clariting 1 in 50 users. Also occasionally reported are stomachache, headache, diarrhea, constipation & dry mouth & throat. In older men zyrtec can sometimes cause difficulty with urination.

Answered 6/24/2014

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