Can you give Calpol and Ibuprofen together? The complete guide
It's the question every parent ends up googling: your child has a stubborn fever, Calpol alone isn't doing it, and you remember someone saying you can alternate with ibuprofen. Can you? Should you? How?
This guide covers exactly what the NHS, the BNF for Children, and the bottle inserts say. Spoiler: yes, you can, but the rules matter.
The quick answer
- Yes — Calpol and Ibuprofen can be given together or alternated. There's no interaction between paracetamol and ibuprofen.
- The NHS recommends doing this only when one alone isn't enough, not as routine.
- Each medicine sticks to its own interval: Calpol every 4–6h, Ibuprofen every 6–8h. A common alternating pattern is one then the other every 3 hours.
- Track every dose — combining two medicines doubles the risk of losing count.
Are Calpol and Ibuprofen safe together?
Yes. Paracetamol (the active ingredient in Calpol) and ibuprofen are different drugs that work through different mechanisms. There's no harmful interaction when they're in the body at the same time. Both UK guidance and international consensus are clear on this.
The risks aren't from the combination — they're from human error:
- Forgetting which one you gave last and double-dosing on one of them
- Giving ibuprofen when your child shouldn't have it (asthma, dehydration, chickenpox)
- Going past 4 doses of Calpol or 3 doses of Ibuprofen in 24 hours
- Using the wrong measuring spoon or strength of bottle
If you can avoid those, the two medicines work together fine.
When the NHS says to use both
The NHS's advice (and the BNF for Children's clinical guidance) is to not alternate or combine as a default. Pick one medicine first, give it properly, and see if it works. Use the other only if:
- The first medicine isn't controlling the fever or pain
- The fever is high and uncomfortable enough that you're trying to provide more continuous relief
- A pharmacist or GP has specifically recommended it
"Distressed" is a useful word here. Medicine is for distress, not for a temperature reading. A child running around with a 38.5°C temperature doesn't necessarily need anything. A child who's miserable, can't sleep, or can't drink, does.
How to alternate Calpol and Ibuprofen
The most common pattern is staggered every 3 hours. Each medicine still keeps to its own minimum interval, but because they're different drugs the gaps interleave:
| Time | Medicine | Hours since last dose of that medicine |
|---|---|---|
| 9:00am | Calpol | — |
| 12:00pm | Ibuprofen | — |
| 3:00pm | Calpol | 6h |
| 6:00pm | Ibuprofen | 6h |
| 9:00pm | Calpol | 6h |
| 12:00am | Ibuprofen | 6h |
This works because:
- Each medicine respects its own interval (Calpol: 6h, well above the 4h minimum; Ibuprofen: 6h, at the bottom of its 6–8h range)
- The child gets some active medicine at all times — paracetamol peaks at 1–2 hours and lasts 4–6 hours; ibuprofen peaks at 1–2 hours and lasts 6–8 hours
- The 24-hour totals stay within limits (4 Calpol max, 3 Ibuprofen max)
You can also give them at the same time if you prefer — there's no rule against it. Staggering is just more useful when you're trying to provide continuous relief.
When to give one rather than both
For many illnesses, a single medicine is enough. Picking the right one matters:
Reach for Calpol if…
- Stomach is empty or unsettled
- Calpol doesn't need food.
- Child has chickenpox
- Avoid ibuprofen with chickenpox.
- Child has asthma
- Unless their doctor has cleared ibuprofen.
- Child is dehydrated or vomiting
- Ibuprofen is harder on the kidneys when fluid intake is low.
- Under 3 months and over 4kg, post-vaccination
- Ibuprofen isn't licensed under 3 months.
Reach for Ibuprofen if…
- Teething pain
- There's an inflammation component paracetamol doesn't address.
- Sore throat or earache
- Both involve inflammation.
- Bumps, sprains, swelling
- NSAIDs are better for swelling.
- Fever that didn't budge on Calpol
- Ibuprofen sometimes succeeds where paracetamol didn't, and vice versa.
When NOT to alternate
Skip the combination if any of these apply:
- The first medicine is working — don't add the second just in case.
- Your child has chickenpox or shingles — paracetamol only.
- Your child has asthma — without doctor approval, paracetamol only.
- Your child is dehydrated — including from a stomach bug or hot weather. Paracetamol only.
- Your child has a kidney or liver condition — ask your GP first.
- You've already been alternating for more than 48 hours — a stubborn fever beyond two days warrants a GP call.
Common mistakes when combining
- Treating the temperature, not the child. A fever in a happy, drinking child doesn't need both medicines. Save the second drug for genuine distress.
- Forgetting which was given last. 3am-brain doesn't remember. Write it down, set a timer, or use an app.
- Double-counting cold-and-flu sachets. A Lemsip-style sachet usually contains paracetamol or ibuprofen — that counts toward your daily total.
- Going past 48 hours of alternating. If you're still doing this on day three, see a GP. The medicine is masking something that should be assessed.
- Mixing up the measuring devices. Calpol and Ibuprofen syringes look similar but are calibrated for different concentrations.
The 4-hour minimum, always
For both medicines, the absolute minimum gap between doses of the same medicine is 4 hours. The recommended gap is higher (4–6h for Calpol, 6–8h for Ibuprofen), but in a high-fever situation you can fall back to the minimum.
The 4-hour rule is firm. Don't give Calpol every 3 hours, ever. If 4 hours isn't enough relief, switch to ibuprofen for that gap instead.
Frequently asked questions
Can you give Calpol and Ibuprofen at the same time?
Yes — there's no interaction. The two drugs can be in your child's system simultaneously. More commonly parents stagger them so there's always one medicine working, but giving them together is also fine.
How do you alternate Calpol and Ibuprofen?
A common pattern is one then the other every 3 hours. Each medicine still keeps to its own minimum interval (4h for both, recommended 4–6h for Calpol, 6–8h for Ibuprofen). The NHS recommends only alternating on pharmacist or doctor advice, not as routine.
Why give both medicines?
When a stubborn fever or pain isn't responding to one alone, alternating gives more continuous coverage because the two drugs work differently and clear the body at different rates.
Is it safe to give both at once?
There's no harmful interaction. The risks come from dosing errors or from giving ibuprofen when your child shouldn't have it. Track every dose carefully if alternating.
When should you not alternate?
Don't alternate if your child is dehydrated, has chickenpox, has asthma without doctor approval, has a kidney or liver condition, or if a single medicine is controlling symptoms. And not for more than 48 hours without a GP review.
What if I gave too much of one?
Call NHS 111 immediately, even if your child seems fine. Paracetamol overdose in particular can have delayed effects on the liver.
Can babies under 1 alternate?
Yes if they're old enough for both medicines (Calpol from 2 months, ibuprofen from 3 months and over 5kg) — but at this age, fever is more concerning. If your baby under 1 needs more than one type of medicine, that's a strong reason to call NHS 111 or your GP.
How Dosey helps
Alternating between two medicines is exactly the situation Dosey was built for. The home screen shows both Calpol and Ibuprofen side by side — when each was last given, when each becomes available again, and how many doses you've used in the last 24 hours. No mental maths. No "did you give her some already?" texts at 3am with your partner.
This isn't medical advice. Dosey is a record-keeping tool, not a clinic. The dosing instructions on your specific bottle, and your GP or pharmacist, are the source of truth. If you're worried about your child — especially if you're considering combining medicines for more than 24 hours — call NHS 111 (free) or your GP.