Paracetamol is ineffective at treating back pain and osteoarthritis despite being a recommended treatment, a group of Australian researchers has warned.
Their review of 13 clinical trials, said the drug did not reduce disability or improve quality of life.
Instead, the group warned, it increased the odds of liver problems.
The NHS is to review its guidelines. Experts say patients should consult a doctor before changing medicines.
Back pain is a leading cause of disability and it is estimated to affect 26 million people each year.
However, questions have been raised about the quality of the evidence which led to the decisions.
They concluded that paracetamol was “ineffective” at reducing back pain.
In osteoarthritis in the hip or knee, they found a small improvement with paracetamol. Yet the impact was so small it was “not clinically important”.
Gustavo Machado, one of the researchers, argued: “Paracetamol is the most widely used over-the counter medicine for musculoskeletal conditions so it is critical that we review treatment recommendations in light of this new evidence.
“In our research, paracetamol for low back pain and osteoarthritis was also shown to be associated with higher risk of liver toxicity in patients.
“Patients were nearly four times more likely to have abnormal results on liver function tests compared to those taking placebo pills.”
However, he added: “While the effectiveness of exercise for both osteoarthritis and spinal pain is established, we know that uptake of and adherence to exercise is poor.”
Jane Tadman said: “We’ve known for some time that paracetamol may not work for everyone with severe pain from their arthritis, but some people find it helps them and allows them to sleep and to exercise without discomfort.
“Physical activity is probably a better and more effective way of keeping the pain of arthritis and joint pain at bay than taking currently available painkillers.”
Prof Roger Knaggs said: “There are other medicines, such as nonsteroidal anti-inflammatory drugs and opioids, which may provide better pain relief but these are associated with a range of other side-effects.
Source:BBC
N.H.Khider