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Piriton Hayfever & Allergy Relief Syrup for Children -150ml

Piriton Hayfever & Allergy Relief Syrup for Children -150ml

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  • ✔️ Relieves hayfever, hives, and allergic skin reactions in children
  • ✔️ Suitable for children aged 1 year and over
  • ✔️ Contains chlorphenamine maleate 2mg/5ml for targeted allergy relief
  • ✔️ Liquid format makes dosing easy for toddlers and young children
  • ✔️ Helps reduce itching, sneezing, and runny nose caused by allergens

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Is Piriton Syrup for Children Right for Your Child's Allergies?

 

When your child is sneezing constantly, rubbing their eyes, or covered in an itchy rash, you want something that works — and fast. Piriton syrup for children is one of the most recognised antihistamine liquids available over the counter in the UK, trusted by parents for decades. Each 150ml bottle contains chlorphenamine maleate 2mg/5ml, a first-generation antihistamine that helps calm the body's allergic response. It's suitable for children aged 1 year and over, making it a practical option for toddlers and school-age children alike. You can browse our full range of allergy and hay fever treatments if you're looking for additional options alongside this syrup.

Allergies in children are incredibly common. Whether it's seasonal hayfever, a reaction to pet dander, dust mites, or an allergic skin condition like urticaria (hives), the symptoms can be distressing for both child and parent. Piriton syrup is licensed to relieve these symptoms quickly, and at just £5.99 for a 150ml bottle, it's an accessible choice for most families.

 

How Does Piriton Syrup Work to Relieve Allergy Symptoms?

 

Chlorphenamine maleate, the active ingredient in Piriton syrup, works by blocking histamine H1 receptors in the body. When your child encounters an allergen — pollen, animal fur, or a food trigger — their immune system releases histamine, which causes the familiar symptoms of an allergic reaction. By blocking those receptors, chlorphenamine reduces the cascade of symptoms before they take hold.

  • Histamine is released when the immune system detects an allergen
  • Histamine binds to H1 receptors, triggering sneezing, itching, and inflammation
  • Chlorphenamine maleate competitively blocks these H1 receptors
  • Symptoms such as runny nose, watery eyes, and skin itching are reduced
  • Being a first-generation antihistamine, it also crosses the blood-brain barrier, which is why drowsiness can occur

 

Who Should Use Piriton Syrup and Is It Suitable for Your Child?

 

Piriton syrup is designed for children aged 1 year and over who are experiencing allergy-related symptoms. It is not suitable for babies under 12 months. The liquid formulation makes it far easier to administer to young children who cannot swallow tablets.

  • Children aged 1–12 years with hayfever symptoms (sneezing, runny nose, itchy eyes)
  • Children experiencing allergic skin reactions such as hives or eczema flares triggered by allergens
  • Children with insect bite reactions causing localised itching and swelling
  • Children with allergic rhinitis due to pet dander or dust mites

It is not recommended for children with certain conditions — see the contraindications section below for full details. If your child has asthma, epilepsy, or liver problems, always speak to your GP or pharmacist before use.

 

How Does Piriton Syrup Compare to Other Children's Antihistamines?

 

Feature Piriton Syrup (Chlorphenamine) Cetirizine Syrup (e.g. Piriteze)
Active ingredient Chlorphenamine maleate 2mg/5ml Cetirizine hydrochloride 5mg/5ml
Generation First-generation (sedating) Second-generation (non-sedating)
Minimum age 1 year 2 years (syrup formulations)
Drowsiness risk Higher — may cause sedation Lower — less sedating
Dosing frequency Up to 4 times daily Once daily

 

How Should Piriton Syrup Be Stored and Is It Clinically Suitable?

 

Store Piriton syrup below 25°C, away from direct sunlight and out of reach of children. Do not use after the expiry date printed on the bottle. Once opened, use within the period stated on the label. If you're also managing other childhood health concerns, our baby and toddler health range includes a variety of products to support your child's wellbeing.

Clinically, piriton syrup for children is appropriate for short-term allergy management. It should not be used as a long-term daily treatment without medical supervision. If your child's allergy symptoms are persistent or severe, a GP referral for allergy testing may be warranted.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Piriton Hayfever & Allergy Relief Syrup for Children 150ml specifications
Treatment category Antihistamine / Allergy Relief
Mechanism of action H1 histamine receptor antagonist
Effective for Hayfever, allergic rhinitis, urticaria, insect bite reactions, allergic skin conditions
Suitable for Children aged 1 year and over
Active ingredient Chlorphenamine maleate 2mg/5ml
Pack size 150ml
UK classification P (Pharmacy medicine)
Drug class First-generation antihistamine
Preparation Oral syrup
Route of administration Oral

Specifications of Piriton Hayfever & Allergy Relief Syrup for Children 150ml

 

What Is Piriton Syrup and What Is It Used For?

 

Piriton Hayfever & Allergy Relief Syrup for Children contains chlorphenamine maleate 2mg/5ml. It belongs to a class of medicines called antihistamines, specifically first-generation H1 receptor antagonists. It is used to relieve the symptoms of allergic conditions in children aged 1 year and over, including hayfever (seasonal allergic rhinitis), perennial allergic rhinitis, urticaria (hives), allergic reactions to insect bites and stings, and food allergies. It may also be used to relieve itching associated with chickenpox, though always check with a pharmacist first.

 

What Do You Need to Know Before Using Piriton Syrup?

 

Do not give Piriton syrup to your child if any of the following apply:

  • Your child is under 1 year of age
  • Your child is allergic to chlorphenamine maleate or any other ingredient in the syrup
  • Your child is taking monoamine oxidase inhibitors (MAOIs) or has taken them within the last 14 days
  • Your child has a rare hereditary problem of fructose intolerance (the syrup contains sucrose)

Speak to your GP or pharmacist before giving this medicine if your child has:

  • Asthma or chronic obstructive airways disease
  • Epilepsy or a history of seizures
  • Liver or kidney problems
  • Difficulty passing urine (urinary retention)
  • Glaucoma (raised pressure in the eye)
  • Cardiovascular disease or high blood pressure

Known drug interactions — tell your pharmacist if your child is taking:

  • Other sedating medicines, including sleeping tablets or sedative antihistamines
  • Antidepressants, particularly tricyclics or MAOIs
  • Antipsychotic medicines
  • Anxiolytics or hypnotics
  • Phenytoin (used for epilepsy)

 

How Should You Use Piriton Syrup Correctly?

 

Always use Piriton syrup exactly as described on the label or as directed by your pharmacist. Use the measuring spoon or oral syringe provided — never use a household teaspoon, as this may give an inaccurate dose.

  1. Shake the bottle gently before each use
  2. Measure the correct dose using the measuring spoon provided
  3. Give the syrup by mouth — it can be given with or without food
  4. Do not give more than the recommended number of doses in 24 hours
  5. If symptoms persist beyond a few days, consult your pharmacist or GP
Age Group Dose Frequency Maximum daily doses
1–2 years (under medical supervision only) 2.5ml (1mg) Twice daily 2
2–5 years 2.5ml (1mg) Up to 4 times daily 4
6–12 years 5ml (2mg) Up to 4 times daily 4

Note: For children aged 1–2 years, use only under medical supervision. Do not give to children under 1 year.

 

What Are the Possible Side Effects of Piriton Syrup?

 

Like all medicines, Piriton syrup can cause side effects, although not every child will experience them. If your child develops a serious allergic reaction (difficulty breathing, swelling of the face or throat, severe rash), stop the medicine and seek emergency medical help immediately. For general allergy and cold-related concerns, you might also find our cold and flu range helpful for managing overlapping symptoms.

Common side effects (may affect more than 1 in 10 children):

  • Drowsiness and sedation
  • Dry mouth, nose, or throat
  • Dizziness or impaired coordination
  • Headache
  • Gastrointestinal upset (nausea, stomach discomfort)

Less common side effects (may affect fewer children):

  • Blurred vision
  • Difficulty passing urine
  • Palpitations or rapid heart rate
  • Paradoxical excitability (particularly in young children — restlessness, irritability, insomnia)
  • Skin rashes or photosensitivity

 

How Should You Store Piriton Syrup?

 

Correct storage helps maintain the medicine's effectiveness and safety. If you're building a home medicine cabinet, our first aid collection has everything you need alongside allergy treatments.

  • Store below 25°C in a cool, dry place
  • Keep away from direct sunlight and heat sources
  • Keep the bottle tightly closed when not in use
  • Keep out of the sight and reach of children
  • Do not use after the expiry date printed on the bottle or carton
  • Do not dispose of medicines via wastewater or household waste — return unused medicine to your pharmacy

Written and reviewed by our qualified team

Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy Piriton syrup for children online in the UK?

You can buy Piriton syrup for children directly from Cured Pharmacy, a GPhC-registered UK online pharmacy. It is available without a prescription as an over-the-counter medicine. Browse our full allergy and hay fever range for related products too.

How does Piriton syrup work in a child's body?

Piriton syrup contains chlorphenamine maleate, which blocks H1 histamine receptors in the body. When an allergen triggers the immune system, histamine is released and causes symptoms like sneezing, itching, and a runny nose. By blocking those receptors, chlorphenamine reduces these symptoms relatively quickly after each dose.

What age can children start taking Piriton syrup?

Piriton syrup is suitable for children aged 1 year and over. Children aged 1–2 years should only receive it under medical supervision. It must never be given to babies under 12 months of age.

What is the correct dose of Piriton syrup for a 5-year-old?

Children aged 2–5 years should receive 2.5ml (equivalent to 1mg of chlorphenamine maleate) up to four times daily. Always use the measuring spoon provided with the bottle rather than a household teaspoon. Do not exceed four doses in any 24-hour period.

Will Piriton syrup make my child drowsy at school?

Yes, drowsiness is a well-known side effect of Piriton syrup because chlorphenamine is a sedating, first-generation antihistamine. If your child needs to be alert during the school day, consider speaking to your pharmacist about a non-sedating alternative. Timing doses for evenings or weekends can help minimise disruption.

What are the side effects of Piriton syrup for children?

The most common side effect is drowsiness, but children may also experience dry mouth, dizziness, headache, or an upset stomach. In some young children, a paradoxical reaction of excitability or irritability can occur. If your child develops a rash, difficulty breathing, or swelling of the face, stop the medicine and seek urgent medical attention.

Can I give Piriton syrup to my child with asthma?

Caution is advised for children with asthma, as chlorphenamine can thicken bronchial secretions and potentially worsen breathing difficulties. Always consult your GP or pharmacist before giving Piriton syrup to a child with asthma or any lower respiratory tract condition. They can advise on the safest option for your child's specific situation.

How long can my child take Piriton syrup for?

Piriton syrup is intended for short-term relief of allergy symptoms. If your child's symptoms persist beyond a few days without improvement, or if they recur frequently, speak to your GP. Long-term daily use without medical supervision is not recommended.

What happens if my child accidentally takes too much Piriton syrup?

If you think your child has taken more than the recommended dose, contact NHS 111 or go to your nearest A&E immediately. Symptoms of overdose may include extreme drowsiness, excitability, rapid heart rate, or seizures. Always keep medicines stored safely out of children's reach.

What should I do if I miss giving my child a dose of Piriton syrup?

If you miss a dose, give it as soon as you remember — unless it is nearly time for the next dose. In that case, skip the missed dose and continue as normal. Never give a double dose to make up for a missed one.

Is Piriton syrup suitable for children with food allergies?

Piriton syrup can help relieve mild allergic symptoms associated with food allergies, such as itching or hives. However, it is not a treatment for anaphylaxis — a severe, life-threatening allergic reaction. Children with known severe food allergies should carry an adrenaline auto-injector (such as an EpiPen) as prescribed by their doctor.

How does Piriton syrup compare to cetirizine syrup for children?

Piriton syrup (chlorphenamine) is a first-generation antihistamine that causes more drowsiness but is suitable from age 1. Cetirizine syrup is a second-generation antihistamine, generally less sedating and dosed once daily, but typically licensed from age 2. Your pharmacist can help you choose the most appropriate option for your child's age and lifestyle.

Can Piriton syrup be used for chickenpox itching in children?

Chlorphenamine is sometimes used to help relieve the itching associated with chickenpox in children. However, always check with your pharmacist or GP before using it for this purpose, as guidance on suitability and dosing may vary. Keeping nails short and using cooling creams can also help manage chickenpox itch.

What are the alternatives to Piriton syrup for children's allergies?

Alternatives include cetirizine syrup (non-sedating, from age 2), loratadine syrup (non-sedating, from age 2), and sodium cromoglicate eye drops for eye-specific symptoms. For a broader look at children's allergy options, visit our baby and toddler health range. Your pharmacist can advise on the most suitable choice.

What is the latest guidance on antihistamines for children in the UK?

The NHS and NICE recommend antihistamines as a first-line treatment for mild to moderate allergic conditions in children, including hayfever and urticaria. Non-sedating antihistamines are generally preferred for daytime use to avoid affecting school performance. Always follow current NHS guidance and consult a healthcare professional if you are unsure which antihistamine is right for your child.

How Should You Use Piriton Hayfever & Allergy Relief Syrup for Children?

Always use Piriton syrup exactly as described on the product label or as directed by your pharmacist. Using the correct measuring tool is essential — never use a household teaspoon, as this can result in an inaccurate dose being given to your child.

Follow these steps each time you give a dose:

What Is the Correct Dose of Piriton Syrup for Children?

The dose depends entirely on your child's age. Never exceed the maximum number of doses in any 24-hour period. If you are unsure about the correct dose for your child, ask your pharmacist before giving the medicine.

When Is the Best Time to Use Piriton Syrup for Children?

Because Piriton syrup can cause drowsiness, timing your child's doses thoughtfully can make a real difference to their day. For children who need to be alert at school or during daytime activities, consider giving doses in the evening or at bedtime where possible, particularly if symptoms are manageable during the day.

For hayfever, giving a dose before your child is exposed to high pollen environments — such as before going outdoors on high pollen count days — may help reduce the severity of symptoms. Check the daily pollen forecast on the Met Office website to plan ahead.

How Long Can You Use Piriton Syrup for Children?

Piriton syrup is suitable for short-term relief of allergy symptoms. Most children use it during periods of high allergen exposure, such as the hayfever season, or for a few days following an allergic reaction. It is not intended as a long-term daily treatment without medical oversight.

If your child's symptoms continue beyond a few days without improvement, or if they are experiencing frequent allergic episodes throughout the year, speak to your GP. They may recommend allergy testing or a longer-term management plan tailored to your child's needs.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

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What Are the Most Common Side Effects of Piriton Syrup for Children?

The most frequently reported side effect of Piriton syrup is drowsiness. Because chlorphenamine maleate is a first-generation antihistamine, it crosses the blood-brain barrier and has a sedating effect on many children. This can actually be useful at night when itching or sneezing is disrupting sleep, but it's worth being aware of during the day.

  • Drowsiness and sedation
  • Dry mouth, nose, or throat
  • Dizziness or feeling unsteady
  • Headache
  • Nausea or stomach discomfort

What Are the Less Common Side Effects of Piriton Syrup for Children?

Some children may experience side effects that are less frequent but still worth knowing about. In particular, young children can occasionally have a paradoxical reaction — meaning instead of becoming drowsy, they become unusually excitable, restless, or irritable. If you notice this, stop the medicine and speak to your pharmacist.

  • Blurred vision
  • Difficulty passing urine (urinary retention)
  • Palpitations or a faster-than-normal heart rate
  • Paradoxical excitability, restlessness, or insomnia (particularly in young children)
  • Skin sensitivity to sunlight (photosensitivity)
  • Skin rash

What Are the Serious Side Effects of Piriton Syrup for Children?

Serious side effects are rare but require immediate medical attention. If your child develops any of the following after taking Piriton syrup, stop the medicine straight away and call 999 or go to your nearest A&E:

  • Difficulty breathing or wheezing
  • Swelling of the face, lips, tongue, or throat (signs of angioedema)
  • Severe skin rash or blistering
  • Seizures or convulsions
  • Loss of consciousness

What Should You Do If Your Child Experiences Side Effects?

For mild side effects such as drowsiness or dry mouth, these often resolve on their own and do not usually require stopping the medicine. Ensuring your child drinks plenty of water can help with dry mouth. If drowsiness is a concern during the day, speak to your pharmacist about whether a non-sedating antihistamine might be more appropriate.

You can report suspected side effects of any medicine in the UK through the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk. This helps regulators monitor the safety of medicines in real-world use.

Can Piriton Syrup Interact With Other Medicines Your Child Takes?

Yes. Chlorphenamine maleate can interact with several other medicines, increasing the risk of side effects — particularly sedation. Always tell your pharmacist about every medicine your child is currently taking, including herbal remedies and supplements, before starting Piriton syrup.

  • MAOIs (monoamine oxidase inhibitors) — do not use together; risk of serious interaction
  • Other sedating medicines, including sleeping tablets or sedative antihistamines
  • Tricyclic antidepressants — increased sedation and anticholinergic effects
  • Antipsychotic medicines
  • Phenytoin (used for epilepsy) — chlorphenamine may affect phenytoin levels

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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