1. How quickly does it work and how long does it last?
It often starts working within 1–2 hours and lasts about 24 hours.
What are Piriteze Allergy Tablets?
Piriteze Antihistamine Allergy Relief Tablets are used to relieve common allergy symptoms, including:
- Hay fever symptoms such as sneezing, a runny or blocked nose, and itchy or watery eyes
- Allergies caused by pets, house dust mites, and mould spores
- Hives and itchy skin reactions
Piriteze contains cetirizine, an antihistamine that helps reduce the effects of histamine, the chemical your body releases during an allergic reaction.
Active ingredient: Cetirizine
Who can take Piriteze?
Piriteze is suitable for:
- Adults
- Children aged 6 years and over
Piriteze is not suitable for:
- Children under 6 years (use a suitable children’s product instead)
- Anyone allergic to cetirizine or any ingredients in the tablets
Speak to a pharmacist before use if you have kidney problems, are pregnant or breastfeeding, or take regular medicines.
How to take Piriteze Allergy Tablets?
Typical use:
Adults and children aged 12 years and over:
One tablet (10mg) to be taken once daily.
Children aged 6–11 years:
Half a tablet (5mg) to be taken twice daily, morning and evening.
Important information:
- The effects last for around 24 hours.
- Most people do not feel drowsy, but some may feel mildly sleepy. Avoid driving or operating machinery if affected.
If you miss a dose
Take it when you remember, then continue as normal. Do not take two doses at once.
If you take too much
Seek medical advice. Too much may cause drowsiness, agitation, or a fast heartbeat.
How to store Piriteze
- Store in a cool, dry place
- Keep in the original packaging
- Keep out of sight and reach of children
- Do not use after the expiry date
Common side effects can include:
- Headache or dizziness
- Drowsiness or tiredness, or restlessness
- Dry mouth or sore throat
- Stomach pain, diarrhoea, nausea
- Runny nose
Stop taking and seek urgent medical help if you have signs of a serious allergic reaction, such as swelling of the face or throat, or breathing difficulties.
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Frequently Asked Questions
2. Will it make me sleepy? Can I drive?
Most people don’t feel drowsy, but some do. If you feel sleepy or dizzy, don’t drive or use machinery.
3. Can I drink alcohol while taking Piriteze?
It’s best to limit or avoid alcohol, as it can increase drowsiness.
4. Is Piriteze OK in pregnancy or breastfeeding?
Cetirizine is commonly used, but you should still check with a pharmacist or clinician, especially if breastfeeding and your baby seems unusually sleepy.
5. How long can I take Piriteze for?
You can take it daily during allergy season. If symptoms persist, worsen, or you need it long-term, speak to a pharmacist.
Our Clinical Authors
This page has been written by a registered UK pharmacist and reviewed by our clinical team to ensure it is accurate, clear and reflects current clinical guidance.
Last medically reviewed: 06 July 2026
Last updated: 06 July 2026