Cetirizine (Cetirizine hydrochloride) — Uses, Dosage, Side Effects & Safety

Drug class: Second-generation antihistamine

Overview

Cetirizine is an antihistamine used to relieve allergy symptoms such as sneezing, runny nose, itchy or watery eyes, and itching of the throat or nose. It is also effective in treating itching and swelling caused by chronic urticaria (hives). Cetirizine works by blocking the action of histamine, a substance in the body that causes allergic symptoms. Cetirizine is considered a 'non-drowsy' antihistamine, meaning it is less likely to cause sleepiness compared to older antihistamines. However, some people may still experience mild drowsiness. It is available over-the-counter in many countries and is suitable for both adults and children (with age-appropriate dosing). Key points: Cetirizine starts working within an hour, provides 24-hour relief, and can be taken with or without food. Always follow your healthcare provider's instructions and do not exceed the recommended dose.

Therapeutic uses

• Allergic rhinitis
• Chronic urticaria

Common side effects

• Drowsiness
• Fatigue
• Dry mouth
• Headache
• Dizziness
• Nausea
• Sore throat

Frequently Asked Questions about Cetirizine

How quickly does cetirizine work?

Cetirizine usually starts to relieve allergy symptoms within 1 hour of taking a dose, with maximum effect in about 2–3 hours.

Can I take cetirizine every day?

Yes, cetirizine can be taken daily for ongoing allergy symptoms or chronic urticaria, but only as directed by your healthcare provider.

Is cetirizine safe during pregnancy?

Cetirizine is generally considered safe in pregnancy when used at recommended doses, but you should consult your doctor before use.

Does cetirizine make you sleepy?

Cetirizine is less likely to cause drowsiness than older antihistamines, but some people may still experience mild sleepiness.

Can children take cetirizine?

Yes, cetirizine is approved for use in children as young as 2 years old, with age-appropriate dosing. Always use the correct formulation and dosing device.

Can I drink alcohol while taking cetirizine?

It is best to avoid alcohol while taking cetirizine, as it may increase the risk of drowsiness and impair your ability to perform tasks requiring alertness.

What should I do if I experience side effects?

If you experience mild side effects, such as drowsiness or dry mouth, these often resolve on their own. For severe reactions (difficulty breathing, swelling, severe rash), seek immediate medical attention.

Educational information only. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.