Hi Steph,
I can't find any source showing thrush as a side effect for cetirizine hydrochloride (Zyrtec), but almost any side effect is potentially possible, because each of us can react differently to the same medicine. If you are concerned, give your doctor a call. That's what he/she is there for!
To your health,
Kathi
Important:
We hope you find this general health information helpful. Please note however, that this Q&A is meant to support not replace the professional medical advice you receive from your doctor. No information in the Answers above is intended to diagnose or treat any condition. The views expressed in the Answers above belong to the individuals who posted them and do not necessarily reflect the views of The HealthCentral Network. The HealthCentral Network does not review or edit content posted by our community members, but reserves the right to remove any material it deems inappropriate.