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Zyrtec Tablet — Side Effects & Warnings

Known side effects of Zyrtec Tablet include Sleepiness/drowsiness, fatigue, dry mouth, headache, dizziness, nausea, sore throat. Not everyone experiences these side effects.

Medically reviewed by Dr. Balaji Krishnan, MBBS · Updated August 2026

Common Side Effects

Sleepiness/drowsiness
fatigue
dry mouth
headache
dizziness
nausea
sore throat

This is not an exhaustive list. Consult your doctor if you notice any unusual symptoms.

Important Warnings

Use with caution in kidney disease (dose adjustment may be needed). May cause drowsiness in some patients—avoid driving/operating machinery until you know the effect. Consult a doctor before use in children, elderly, or if you have urinary retention/prostate enlargement. Stop and seek medical help if signs of severe allergy occur.

Drug Interactions

Zyrtec Tablet may interact with the following:

Alcohol (increased drowsiness)
CNS depressants/sedatives (additive sedation)
theophylline (may reduce cetirizine clearance at high doses)
other antihistamines (increased side effects)

Always tell your doctor about all medicines you are taking, including over-the-counter drugs and supplements.

Pregnancy Safety

Use with caution / Consult doctor

Alcohol Interaction

Use with caution

Habit Forming

Storage

Store below 25°C in a dry place, protected from light and moisture. Keep out of reach of children.

Zyrtec Tablet — Safety Summary

Composition: Cetirizine (10mg)
Prescription: Required (Rx)
Pregnancy: Use with caution / Consult doctor
Alcohol: Use with caution
Habit forming: No

Zyrtec Tablet — Safety FAQs

What should I do if I experience side effects?

Mild side effects often resolve on their own. If side effects are severe or persistent, stop the medicine and consult your doctor immediately.

Are all listed side effects common?

No. Some side effects are common while others are rare. Not everyone experiences side effects. Consult your doctor if you are concerned.

Can I take this medicine with other drugs?

Some medicines interact with each other. Always inform your doctor about all medicines you are currently taking.

When should I seek emergency help?

Seek immediate medical attention if you experience severe allergic reactions (difficulty breathing, swelling of face/throat), chest pain, or any life-threatening symptoms.

Get help from a doctor

Consult a doctor

Discuss side effects with a qualified doctor online.

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Full product details for Zyrtec Tablet.

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Safety disclaimer

This information is for educational purposes only and is not a substitute for professional medical advice. If you experience severe side effects, seek medical attention immediately.