1. Will Piriton Syrup make me or my child sleepy?
Yes, it can cause drowsiness because it is a sedating antihistamine. Some children may become restless or excitable instead of sleepy. Avoid driving or operating machinery if affected.
What is Piriton Syrup?
Piriton Syrup is a medicine used to relieve allergy symptoms. It contains chlorphenamine maleate, which helps reduce the effects of histamine, the chemical your body releases during an allergic reaction.
Who is it suitable for?
- Adults and teenagers
- Children aged 1 year and over, using age-appropriate doses
Piriton is not suitable for:
- Children under the age of 1
- Anyone allergic to chlorphenamine or any of the other ingredients contained in this medicine
Speak to a pharmacist or doctor before use if you are pregnant or breastfeeding, or if you have glaucoma, epilepsy, liver or kidney problems, severe asthma or breathing problems, prostate problems, or if you are taking medicines that cause drowsiness.
How to use Piriton Syrup
Always follow the label or patient leaflet.
Typical use:
- 1–2 years old: 2.5 ml twice daily
- 2–6 years old: 2.5 ml every 4–6 hours as needed
- 6–12 years old: 5 ml every 4–6 hours as needed
- 12 years old and over: 10 ml every 4–6 hours as needed
Important information:
- This medicine can make you sleepy. Avoid driving, cycling, or operating machinery if affected.
- Some children may become restless or excitable instead of sleepy.
- Do not take with other antihistamines unless a clinician advises.
If you miss a dose
- Take it when you remember, unless it’s nearly time for the next dose.
- Do not take a double dose.
If too much is taken
- Seek urgent medical advice straight away.
- Taking too much can cause severe sleepiness, agitation, confusion, hallucinations, fits, or heart rhythm problems.
How to store Piriton Syrup
- Keep tightly closed and store in a cool, dry place.
- Keep out of sight and reach of children.
- Do not use after the expiry date.
Common side effects can include:
- Drowsiness
- Dizziness or headache
- Dry mouth
- Feeling sick
- Blurred vision
Stop taking Piriton Syrup and seek medical advice if you have a severe reaction, such as swelling of the face or throat, breathing difficulty, or a widespread rash.
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Frequently Asked Questions
2. How quickly does Piriton Syrup work and how long does it last?
It usually starts working within 30–60 minutes. The effects typically last around 4–6 hours.
3. Can Piriton Syrup be taken with other antihistamines?
You should not usually take it with other antihistamines unless advised by a doctor or pharmacist, as this increases the risk of side effects.
4. Can Piriton Syrup be taken during pregnancy or while breastfeeding?
Speak to a healthcare professional before use if you are pregnant or breastfeeding, as it may cause drowsiness in the baby.
5. What should I do if too much Piriton Syrup is taken?
Seek medical advice immediately. An overdose may cause severe drowsiness, confusion, agitation, hallucinations, or heart rhythm problems. Bring the bottle with you if possible.
Our Clinical Authors
Written by
Omar El-Gohary
CEO & Superintendent Pharmacist | GPhC Registration: 2059792
Medically reviewed by
Jabbar Ali
MPharm Clinical Lead | GPhC Registration: 2205490
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: 20 August 2026
Last updated: 21 August 2026