Paracetamol tablets. Reuters
Paracetamol tablets. Reuters
Paracetamol tablets. Reuters
Paracetamol tablets. Reuters

Regular paracetamol use linked to increase in blood pressure, says study


Soraya Ebrahimi
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People with high blood pressure who regularly take paracetamol could be at increased risk of heart disease and strokes, a study suggests.

As a result, researchers say patients who have a long-term prescription for the drug, usually used for the treatment of chronic pain, should be given the lowest effective dose for the shortest time possible.

The scientists say it has been assumed that paracetamol was a completely safe drug to use in patients with chronic pain.

But their findings indicate the effect on blood pressure is similar to non-steroidal anti-inflammatories, such as ibuprofen, which are known to increase blood pressure and risk of heart disease, and also used to manage chronic pain.

The increase in blood pressure might be expected to increase the risk of heart disease or stroke by about 20 per cent, the experts say.

They suggest the study should lead to a review of long-term paracetamol prescriptions to patients, particularly those with the condition, or those at particular risk of heart disease or stroke.

“This study clearly shows that paracetamol, the world’s most used drug, increases blood pressure, one of the most important risk factors for heart attacks and strokes," said Prof James Dear, chairman of clinical pharmacology at the University of Edinburgh.

“Doctors and patients together should consider the risks versus the benefits of long-term paracetamol prescription, especially in patients at risk of cardiovascular disease.

“In summary, we’ve shown that two weeks of treatment with paracetamol increases blood pressure in patients who have hypertension [high blood pressure]."

Lead investigator Dr Iain MacIntyre, consultant in clinical pharmacology and nephrology at NHS Lothian, said: “This is not about short-term use of paracetamol for headaches or fever, which is, of course, fine.

"But it does indicate a newly discovered risk for people who take it regularly over the longer term, usually for chronic pain."

The study found that after people stopped taking the drug, their blood pressure returned to levels at the start of the study, suggesting the drug increased it.

Researchers said they did not have accurate numbers of the people in the UK who were on paracetamol long term and had high blood pressure.

But it is estimated that one in three adults in the UK have high blood pressure increasing with age, while one in 10 people in Scotland, where the research was conducted, take paracetamol regularly, a figure that is likely to be similar elsewhere.

In the study, 110 patients with a history of high blood pressure were prescribed 1 gram of paracetamol four times a day — a dose routinely prescribed for patients with chronic pain — or a placebo for two weeks each.

Researchers found there was a significant increase in the blood pressure of those taking the painkiller, compared with those taking the placebo.

The experts said the study was set up to see a very small effect on blood pressure, and they were surprised to see a much bigger impact.

Prof Dear suggested the research indicates the findings could affect a large number of people.

The scientists say that a limit to their study was that it did not look at patients who had chronic pain.

But there is no reason to think that patients who are taking paracetamol for treatment of pain would have a different blood pressure response to the patients in the study, they say.

“This research shows how quickly regular use of paracetamol can increase blood pressure in people with hypertension who are already at increased risk of heart attacks and strokes," said Prof Sir Nilesh Samani, medical director at the British Heart Foundation, which funded the study.

“It emphasises why doctors and patients should regularly review whether there is an ongoing need to take any medication, even something that may seem relatively harmless like paracetamol, and always weigh up the benefits and risks.”

Dr Richard Francis, head of research at the Stroke Association, said: “High blood pressure is the single biggest risk factor for stroke.

“This new and robust study adds to previous research and suggests regular paracetamol causes blood pressure to quickly increase in people who are already at risk of stroke and heart attacks.

“It’s therefore important that doctors regularly review and weigh up the risks and benefits of prescribing paracetamol.”

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Updated: February 07, 2022, 9:25 PM`