Prescription requiredAnti-allergic (Antihistamine)

Zyrtec Syrup — Side Effects & Warnings

Known side effects of Zyrtec Syrup include Drowsiness, fatigue, dry mouth, headache, dizziness, nausea, stomach pain. Not everyone experiences these side effects.

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

Common Side Effects

Drowsiness
fatigue
dry mouth
headache
dizziness
nausea
stomach pain

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

Important Warnings

May cause drowsiness—avoid driving/operating machinery until you know the effect. Use with caution in kidney disease (dose adjustment may be needed). Consult doctor for liver disease, glaucoma, urinary retention/prostate enlargement, or if symptoms persist. Not recommended for self-use in very young children without medical advice. Stop and seek care if allergic reactions (rash, swelling, breathing difficulty) occur.

Drug Interactions

Zyrtec Syrup may interact with the following:

Alcohol and other CNS depressants (increased drowsiness)
sedatives/sleeping pills
opioids
benzodiazepines; theophylline (may reduce clearance slightly); other antihistamines

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

Avoid

Habit Forming

Storage

Store below 25°C in a cool, dry place away from light. Keep the bottle tightly closed. Do not freeze. Keep out of reach of children.

Zyrtec Syrup — Safety Summary

Composition: Cetirizine (5mg/5ml)
Prescription: Required (Rx)
Pregnancy: Use with caution (consult doctor)
Alcohol: Avoid
Habit forming: No

Zyrtec Syrup — 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.

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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.