This registry is a place to share positive or negative side effects of using Zyrtec. If you directly experienced a side effect while using Zyrtec, then we encourage you to enter it here. Please note that entries here are the experiences of individual users, and in no way means that you or anyone else will experience the same side effect, since the same medication affects people in different ways. Please always contact your physician.
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March 1th
2008
10:40 PM
I took Zyrtec for a few years for severe mold and pollen allergies. I loved the drug as it controlled my allergies much better than Allegra or Claritin. However, I recently stopped taking it after realizing it was causing dizzy spells, drowsiness/constant tiredness and heart flutters. Since I stopped taking it I have lost 6 pounds without making any alterations to my diet and exercising less than normal. This leads me to believe that my weight gain of 30 pounds in the last few years was also part of zyrtec's side effects.
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