Paracetamol and ibuprofen are the two most commonly sold children's medicines in UK pharmacies. The doses on the back of the bottle are the legally required summary, but the weight-based calculations used by the BNF for Children are more precise and are what a pharmacist will talk through at the counter.
This article walks through how UK community pharmacies advise parents on dosing in 2026, when they will refuse to supply, and the red flags that should always trigger urgent review.
Why weight bands matter
NICE NG143 on fever in under-5s notes that children handle analgesics differently from adults, and that age-based dosing over-estimates for slim children and under-estimates for heavier ones. The BNF for Children therefore gives weight-anchored doses for both medicines from birth onwards.
A pharmacist will usually check the child's weight and age before suggesting a product strength. Sugar-free preparations are preferred in line with NHS and Public Health guidance on children's oral health.
Paracetamol — the usual first-line
The BNFC weight-based calculation for paracetamol oral in children is approximately 15 mg per kg up to four times a day, not exceeding 60 mg per kg in 24 hours and never more than the adult maximum of 4 g in 24 hours. Simplified pack-label equivalents for common age bands (NHS patient information):
| Age band | Typical 120 mg/5 mL dose | Maximum doses in 24 hours |
|---|---|---|
| 2 to 3 months (post-immunisation single dose) | 2.5 mL | 2 (4 hours apart) |
| 3 to 6 months | 2.5 mL | 4 |
| 6 to 24 months | 5 mL | 4 |
| 2 to 4 years | 7.5 mL | 4 |
| 4 to 6 years | 10 mL | 4 |
Over 6, the 250 mg/5 mL strength usually becomes the right fit. A pharmacy will ask about the last dose, not just the total number in 24 hours, because the 4-hour interval matters more than the theoretical daily cap.
Ibuprofen — second-line, and not for every child
Ibuprofen is dosed at approximately 5 mg to 10 mg per kg up to three times a day per BNFC, maximum 30 mg per kg in 24 hours. It is not routinely recommended:
- Under 3 months (always GP or specialist advice)
- During chickenpox (NHS advice — use paracetamol only because ibuprofen has been associated with severe skin complications)
- Where the child is dehydrated
- Where there is a history of asthma triggered by NSAIDs
- Where kidney or cardiac disease is known
A community pharmacist will ask these questions before supplying and will decline a sale if any flag is raised.
Alternating paracetamol and ibuprofen
NICE NG143 is careful on this. Alternating should only be considered if the child is still distressed before the next dose of the first medicine, and the aim is comfort, not a lower temperature reading. Routinely giving both at the same time is not recommended. A pharmacist will usually sketch out a four-hour paracetamol schedule plus a six-hour ibuprofen schedule, staggered, and remind parents not to exceed daily maxima for either.
When a UK pharmacy will refuse to supply
Pharmacists are required by GPhC professional standards to refuse any OTC supply where it is unsafe. Common refusal triggers for children's analgesics:
- A child already on regular paracetamol-containing medication (e.g. a combination cold remedy) where the cumulative dose would exceed safe limits
- Dose request outside BNFC range for the child's weight
- Symptoms suggestive of sepsis, meningitis, Kawasaki disease, or appendicitis (fever plus any of: neck stiffness, non-blanching rash, lethargy, bile-stained vomiting)
- Uncontrolled asthma with an NSAID request
- A child under 3 months presenting with fever — this is always a GP, 111, or A&E pathway
Overdose red flags
Paracetamol overdose is the most common paediatric medication overdose presented to UK poisons services. The critical point for parents is that early symptoms may be absent and that liver damage can develop 24 to 72 hours after ingestion. Any suspected accidental overdose — whether the dose exceeded the daily maximum, the intervals were too short, or a child reached the bottle unsupervised — should be reported to NHS 111 or to the National Poisons Information Service through a prescriber immediately. Pharmacies will not attempt to manage paracetamol overdose at the counter.
How the pharmacy fits the wider care pathway
Across the UK, community pharmacies handle the majority of children's fever and analgesia advice, before any escalation to GP or 111. The PharmSee pharmacy finder can be used to identify late-night or weekend pharmacies for when fevers peak outside working hours; parents can also call NHS 111 any time of day for children under 5.
Caveats and sources
Dose ranges quoted are taken from the BNF for Children as published via the NICE BNFC portal. NHS patient information pages for paracetamol and ibuprofen carry the pack-label equivalents. Nothing in this article replaces a conversation with a pharmacist or prescriber, especially for children under 6 months, children with long-term conditions, or when symptoms do not settle within 48 hours.