The short answer
- Piriton + Calpol: fine together from age 1, at the normal dose of each. No interaction.
- Piriton + children’s Nurofen: also fine together, as long as the child can have ibuprofen (not dehydrated, no asthma that ibuprofen worsens, no chickenpox).
- Piriton + Calpol + Nurofen: possible, but give Calpol and Nurofen by their own schedules and only use both painkillers if one alone hasn’t helped.
- Under 1 year: Piriton only if a doctor prescribes it.
Why the combination is safe
Piriton contains chlorphenamine, an older (sedating) antihistamine. It blocks histamine, so it calms itching, hives, sneezing and runny nose from allergies, insect bites or chickenpox spots. Calpol contains paracetamol and children’s Nurofen contains ibuprofen; both bring down temperature and ease pain. None of the three changes how the body handles the others, and their side effects don’t stack in a dangerous way.
That’s why parents are often told to use exactly this combination for chickenpox: chlorphenamine for the itch and paracetamol for the fever. (Ibuprofen is the exception in chickenpox: the NHS advises against it because of a link with serious skin infections.)
Piriton doses by age
Piriton syrup contains 2 mg chlorphenamine in 5 ml. These are the doses in the UK product information (Stand: November 2026). Always check the label of the pack you have, because other chlorphenamine syrups and tablets can differ.
| Age |
Piriton syrup dose |
How often |
Maximum in 24 hours |
| Under 1 year |
Not recommended unless prescribed by a doctor |
| 1–2 years |
2.5 ml (1 mg) |
Twice a day |
5 ml (2 mg) |
| 2–5 years |
2.5 ml (1 mg) |
Every 4–6 hours |
15 ml (6 mg) |
| 6–11 years |
5 ml (2 mg) |
Every 4–6 hours |
30 ml (12 mg) |
| 12 years and over |
10 ml (4 mg) |
Every 4–6 hours |
60 ml (24 mg) |
Piriton Allergy tablets (4 mg) are for children from 6 years (half a tablet) and adults (one tablet); younger children should have the syrup.
How to give them together
Each medicine keeps its own clock. Giving Piriton doesn’t change when the next Calpol or Nurofen dose is due, and vice versa. A simple way to keep track:
- Write down the time and dose of every medicine on paper or in your phone, especially at night or when two adults share care.
- Calpol: at least 4 hours between doses and no more than 4 doses in 24 hours.
- Children’s Nurofen: usually up to 3 doses in 24 hours, 6–8 hours apart (check the age band on the pack), with food or milk.
- Piriton: by the table above. They can all be given at the same moment if they are due at the same time.
- Use the syringe or spoon that came with each medicine; strengths differ between Calpol Infant (120 mg/5 ml) and Calpol SixPlus (250 mg/5 ml).
If you are switching between Calpol and Nurofen because a fever keeps coming back, our article on giving Panadol/Calpol and Nurofen to a child covers the doses by weight and how to alternate safely.
Watch for hidden chlorphenamine and other antihistamines
The real risk with Piriton is not Calpol or Nurofen, it’s giving a second antihistamine without noticing. Several cough and cold products contain chlorphenamine or another sedating antihistamine (diphenhydramine, promethazine, doxylamine). The NHS advises not giving children under 6 any cough or cold medicine containing chlorphenamine.
| Product type |
With Piriton? |
| Calpol, Calpol SixPlus, other paracetamol liquids |
Yes |
| Nurofen for Children, other ibuprofen liquids |
Yes (if ibuprofen suits the child) |
| Cetirizine or loratadine syrups (non-drowsy antihistamines) |
No, don’t combine two antihistamines unless a doctor says so |
| Night-time cough or cold mixtures |
Check the label; many contain a sedating antihistamine |
| Promethazine (Phenergan) or similar |
No |
Side effects to expect
Chlorphenamine usually makes children drowsy, but some become the opposite: restless, excitable or unable to sleep. Dry mouth, blurred vision and, less often, an upset stomach can also happen. If your child becomes unusually hard to wake, very agitated, or has a fit, stop the medicine and get urgent medical advice. Don’t use Piriton to make a child sleep; that isn’t what it is for.
Don’t give Piriton to a child who has epilepsy, glaucoma or problems passing urine without speaking to a pharmacist or doctor first, and don’t give aspirin to children under 16.
When to get medical help
Call 999 (UK), 000 (Australia) or 911 (US) if your child has swelling of the lips, tongue or throat, difficulty breathing, or a rash with a high fever that doesn’t fade when you press a glass on it. Speak to a GP, NHS 111 or a pharmacist if a baby under 3 months has a temperature of 38 °C or more, a fever lasts more than 5 days, your child is not drinking, or allergy symptoms keep coming back.
Frequently asked questions
Can I give Piriton and Calpol at the same time?
Yes. They can be given at the same moment, each at its own dose for the child’s age.
Can a 1-year-old have Piriton and Calpol?
Yes. From age 1, Piriton syrup 2.5 ml twice a day can be given with Calpol Infant at the dose on the pack for the child’s age.
Can I give Piriton with Nurofen for chickenpox?
Piriton is fine for the itch, but use Calpol rather than Nurofen for fever in chickenpox, as the NHS advises avoiding ibuprofen unless a doctor recommends it.
How long does Piriton take to work?
It usually starts to work within about 30 minutes to an hour.
Can I give Piriton and Calpol at night?
Yes. Many parents give both at bedtime when itching and a temperature disturb sleep. Keep to the maximum number of doses in 24 hours.
Sources and further reading
CanforaMedicine Guide
