2 doctors weighed in:
Side effects of using zyrtec (cetirizine) for hives?
2 doctors weighed in

Dr. Andrew Murphy
Internal Medicine - Allergy & Immunology
1 doctor agrees
In brief: Read PI
All medications that are available have included a package insert that describes what the medication is and its side effects.

In brief: Read PI
All medications that are available have included a package insert that describes what the medication is and its side effects.
Dr. Andrew Murphy
Dr. Andrew Murphy
Thank
Dr. Steven Machtinger
Internal Medicine - Allergy & Immunology
In brief: 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.

In brief: 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.
Dr. Steven Machtinger
Dr. Steven Machtinger
Thank
Get help from a real doctor now
Dr. Christopher Crosby
Board Certified, Dermatology
12 years in practice
93K people helped
Continue
108,000 doctors available
Read more answers from doctors