The Stacking Check
The single habit that prevents most medication harm
Here's the practical version before the underlying evidence — everything below is explained and cited in full in the sections that follow.
Before Taking Anything
Check the active ingredient on everything you've already taken that day — including combination cold and flu remedies, which frequently already contain paracetamol, an NSAID, or both.
Add up the total dose across products, not just the dose of the product you're about to take — this is where most accidental overdoses genuinely happen.
If you're on any regular prescription medication, check with a pharmacist before adding a new OTC product — pharmacists are a free, accessible, and underused resource for exactly this question.
The Daily Ceilings Worth Knowing
| Medication | Typical adult ceiling | The catch |
|---|---|---|
| Paracetamol (acetaminophen) | Usually 4g/day (check local packaging) | Hides in combination products — a standalone dose on top of one is the most common way to exceed it |
| NSAIDs (ibuprofen, naproxen, aspirin) | Varies by drug — check packaging | Daily use beyond a few days for a recurring issue is a signal to see a doctor, not a dosing problem to solve |
The one habit that prevents most problems
Check the active ingredient and dose on everything you take in a day — including combination cold remedies — before assuming it's safe to add another painkiller on top.