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cetrizine causing diarrhoea

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Started taking Zyrtec for allergies about two weeks ago. For the past 9 days I have been having off and on loose bowel movements along with normal ones. Can this be caused by the Zyrtec?

Category: Internal Medicine Specialist

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Category: Family Physician-GP
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Thank you for asking the query.

Loose stools or diarrhoea is a known side effect of Cetrizine (Zyrtec). Although it is not common, the pattern of loose stools you are having points towards a possible side effect of the drug.

So if the loose stools are troublesome you should probably stop taking it. You can try other anti allergic medications, but they also might cause the same side effect (because of the anti allergic action). So the best approach would be to see if you can do without it by using other means like nasal spray.

Hope this helps.

Please feel free to ask followup questions.

Dr. John Fuller
Category: Family Physician-GP
MD - New York Institute of Technology, New York College of Osteopathic Medicine
Internship, Family Medicine - Lutheran Medical Center
Residency, Family Medicine - The Mount Sinai Hospital
Dr. John Fuller and 4 other Medical Specialists are ready to help you

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