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Zyrtec Side Effects Center

Medically reviewed by Min Clinic Staff | Updated: January 2026

Zyrtec (Cetirizine) side effects drug center

 

PROFESSIONAL

CONSUMER

SIDE EFFECTS

 

Zyrtec Side Effects Center

What Is Zyrtec?

Zyrtec (cetirizine hydrochloride) is an antihistamine that treats symptoms, such as itching, runny nose, watery eyes, and sneezing from hay fever (allergic rhinitis) and other allergies, such as allergies to molds and dust mites. Zyrtec is available in generic form and over-the-counter (OTC).

What Are Side Effects of Zyrtec?

Common side effects of Zyrtec include:

  • drowsiness,
  • fatigue,
  • tired feeling,
  • dizziness,
  • dry mouth,
  • sore throat,
  • cough,
  • nausea,
  • constipation, or
  • headache.

In children, side effects of Zyrtec include:

  • stomach pain and