Paracetamol is the most-used medicine in India and one of the safest we sell — right up to the point where it is not. The gap between a normal dose and a dangerous one is narrower than most people assume, and almost every case of harm we hear about comes from the same handful of mistakes.

The numbers

For a healthy adult, the usual dose is 500–1000 mg every 4–6 hours, with a hard ceiling of 4000 mg in 24 hours. In practice most guidance now suggests staying at or below 3000 mg a day for anyone taking it for more than a day or two.

That means a maximum of four Calpol 650 tablets in a day comes to 2600 mg — comfortably safe. Six of them is 3900 mg, which is at the edge. For children, the dose is by weight, roughly 10–15 mg per kg per dose, not by age — a heavy four-year-old and a slight seven-year-old may need the same amount.

The mistake almost everyone makes

Doubling up without realising it. Paracetamol is hidden inside a very large number of combination products: cold and flu powders, most cough-and-cold tablets, many prescription painkillers. Someone takes two Calpol for fever, then a sachet of cold powder two hours later, then a combination tablet at night — and has quietly crossed the daily limit without taking a single “extra” dose.

Read the composition on every pack, not just the brand name. If it says paracetamol or acetaminophen anywhere, it counts towards your total.

Who needs to be more careful

• Anyone who drinks regularly. Alcohol and paracetamol are processed by the same liver pathway. The safe ceiling drops substantially, and this is the single biggest risk factor.
• People with existing liver disease, and anyone who is significantly underweight or malnourished.
• People on warfarin. Regular high-dose paracetamol can raise INR.
• People taking it for many days. Occasional maximum dosing is very different from a fortnight of it.

Why an overdose is dangerous even when you feel fine

This is the part worth understanding. In the first 24 hours after a significant paracetamol overdose, people often feel nothing worse than mild nausea. The liver damage happens quietly and only becomes obvious after two or three days — by which point treatment is far less effective.

If you suspect an overdose, do not wait to see how the person feels. Go to a hospital the same day. The antidote works extremely well when given early and poorly when given late.

Practical habits that prevent all of this

Keep one packet, not five loose strips in different rooms. Write the time on the strip when you take a dose during a fever — it is very easy to lose track at 3 am. And do not keep taking it for an undiagnosed fever beyond about three days; at that point the question is not the fever, it is what is causing it.

If you are unsure whether two medicines you have been given overlap, bring both packs in or send photos on WhatsApp. Checking a composition takes us a moment and it is the sort of thing worth checking.

Written by Roshan Kumar Gupta, registered pharmacist (Reg. No. 38441/OPC, Odisha Pharmacy Council) and proprietor of Gupta Meds, CDA Sector 13, Cuttack.

This article is general information, not a substitute for a consultation. Always follow the advice of your own doctor or pharmacist for your specific situation.

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