Paracetamol Dosing Limits: What To Do
Staying within the limits of the most commonly taken medicine in the UK.
Last revised
It is the commonest cause of acute liver failure in the UK, and overdose causes no symptoms at first.
Key takeaways
- Adult maximum: 4g in 24 hours, usually 1g four times a day
- Minimum interval: 4 hours between doses
- Most useful single change: Check every product you take; many cold remedies contain paracetamol.
- Commonest mistake: Combining branded cold and flu products with plain paracetamol.
- See a doctor if any of the signs under "When to get help" below apply to you.
Do
- Check every product you take; many cold remedies contain paracetamol
- Keep at least four hours between doses
- Ask a pharmacist about lower dosing if you are underweight
Do not
- Combining branded cold and flu products with plain paracetamol
- Exceeding 4g in 24 hours, even by one dose
- Waiting for symptoms after taking too much
The figures behind the list
Each item above follows from these, published in the guidance named at the foot of the page.
| Measure | Figure |
|---|---|
| Adult maximum | 4g in 24 hours, usually 1g four times a day |
| Minimum interval | 4 hours between doses |
| Higher risk | low body weight, regular alcohol, malnutrition, liver disease |
| Treatment | highly effective if started early |
Where to go next
- Paracetamol Dosing Limits: The Quick Reference
- Paracetamol Dosing Limits: What Published Guidance Supports
- Paracetamol Dosing Limits — the reference entry
- Antibiotic Stewardship: Sorting the Evidence From the Noise
- What the Guidance Really Says About Medicines and Driving
When to get help
Go to A&E or call 999 immediately after any paracetamol overdose, even if you feel completely well — treatment works best before symptoms appear and much less well afterwards. Never wait to see how you feel.
Where this comes from
How this page was put together
Every figure, recommendation and warning above is taken from the guidance named in Where this comes from. Nothing on this page is inferred, summarised or generalised beyond what those bodies publish: where they give a number, it is their number, and where they are silent, so are we. Pages are rebuilt whenever the underlying record changes. Sign-off by a named clinician, where it has happened, is shown at the top of the page along with the date.
Medical disclaimer
This article is general information, not medical advice. It cannot account for your own history, medication or circumstances. Always speak to a GP, pharmacist or another qualified health professional before making changes that affect your treatment, and never delay seeking medical advice because of something you have read here. In an emergency, call 999.