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Cetirizine is a non-drowsy antihistamine that works by blocking the effects of histamine, a substance released by the body during an allergic reaction. By reducing histamine activity, cetirizine helps relieve common allergy symptoms without causing significant sedation in most people.

It starts to work within about 1 hour and provides relief for up to 24 hours, making it suitable for once-daily dosing. Cetirizine is commonly used for seasonal allergies (hay fever), year-round allergies, and allergic skin conditions such as urticaria (hives).

Some people may still experience mild drowsiness. Alcohol should be avoided until you know how the medicine affects you.

What is cetirizine used for?

Cetirizine is used to treat allergy symptoms such as sneezing, itchy or runny nose, itchy or watery eyes, and skin rashes including hives.

They are suitable for adults and children aged 6 years and over.

Take one tablet once daily, preferably at the same time each day, as directed in the leaflet.

Cetirizine usually starts to work within 30–60 minutes.

Most people do not feel drowsy, but a small number may experience tiredness or dizziness.

Do not drive or operate machinery if you feel drowsy or less alert after taking it.

Cetirizine can usually be taken with other medicines, but check with a pharmacist if you are taking other antihistamines or medicines that cause drowsiness.

If symptoms persist or worsen despite treatment, consult your GP or pharmacist for further advice.

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