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January 17, 2012

Paracetamol warning: 'Slightly too much can cause overdose'


Taking slightly too much paracetamol day after day can be fatal, experts have warned.
A dangerous dose might just be a few pills too many taken regularly over days, weeks or months, they said.
Researchers at Edinburgh University saw 161 cases of "staggered overdose" at its hospital over a 16-year period.
People taking tablets for chronic pain might not realise they were taking too many or recognise symptoms of overdose and liver injury, they said.

The researchers told the British Journal of Clinical Pharmacology that this life-threatening condition could be easily missed by doctors and patients.
Doctors may not initially spot the problem because blood tests will not show the staggeringly high levels of paracetamol seen with a conventional overdose, where someone may have swallowed several packets of the drug.

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Over time the damage builds up and the effect can be fatal”
Lead researcher Dr Kenneth Simpson
Patients who have taken a staggered overdose tend to fare worse than those who have taken a large overdose, the study suggests.
Dr Kenneth Simpson and colleagues looked at the medical records of 663 patients who had been referred with paracetamol-induced liver injury to the Scottish Liver Transplantation Unit at the university hospital.
The 161 who had taken a staggered overdose were more likely to develop liver and brain problems and need kidney dialysis or help with their breathing. They were also more likely to die of their complications.
Dr Simpson said: "They haven't taken the sort of single-moment, one-off massive overdoses taken by people who try to commit suicide, but over time the damage builds up, and the effect can be fatal."
Professor Roger Knaggs of the Royal Pharmaceutical Society said patients should heed the warning.
"If people experience pain and paracetamol doesn't help, rather than thinking a 'top up' dose may work, they should consult their pharmacist for alternative pain control or referral to someone who can help with the cause of the pain.
"The message is clear: if you take more paracetamol than is recommended, you won't improve your pain control but you may seriously damage your health.
"At this time of year people should also take care with combination cold and flu products which may have paracetamol as one of the ingredients. It's easy to take more than intended, so if in doubt consult your pharmacist."
Recommended dose
  • Take paracetamol as directed on the packet or patient information leaflet that comes with the medicine
  • Each tablet usually contains 500mg
  • Adults can take 1-2 tablets of paracetamol 4-6 hourly, up to four times a day
  • This means you should not take more than 8 tablets (4g) in a 24-hour period
  • If you accidentally take an extra dose of paracetamol, you should miss out the next dose so that you do not take more than the recommended maximum dose for a 24-hour period.
Source: BBC News
by
Akshaya Srikanth
Pharm.D Internee


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