A WARNING has been issued to anyone who takes paracetamol over a bizarre side effect.
Researchers in the US found that the common pills can alter your perception of risk, potentially putting you in danger.
While you might get some relief after taking them, researchers found that people who popped the pills were willing to take more risks than those given a placebo drug.
The study, carried out by experts at the Ohio State University in 2020, found that the painkillers, known as acetaminophen in the US, not only treats headaches, but can also allow you to feel more tolerant to risk.
Acetaminophen is also the main ingredient in Tylenol, which is widely used across the US.
In one study, 189 participants were given either 1,000mg of the pain reliever, which is the recommended dose to treat a headache, or a placebo drug that looked the same.
After waiting for the pill to kick in, researchers quizzed the participants and asked them to rate on a scale of one to seven how risky they thought various activities were.
Those who had taken the paracetamol rated activities such as walking home alone at night in an unsafe area, skydiving, bungee jumping and starting a new career in your 30s as less risky than the participants who took the placebo.
Neuroscientist Baldwin Bay, from the department of psychology at Ohio State University said acetaminophen seems to make people feel less negative emotions when they consider risky activities.
This he said, means they don’t feel as scared as they might usually.
“Reduced risk perceptions and increased risk-taking could have important effects on society”, Bay added.
The results of the study were published online in the journal Social Cognitive and Affective Neuroscience.
Experts also analysed people through a virtual test.
They used an experiment where participants could earn rewards by inflating a virtual balloon on a computer.
The experts found that people who had taken the paracetamol were more likely to inflate the balloon so it was close to bursting, while some even went too far – resulting in the virtual balloon popping.
Way added that participants would earn virtual money with every pump and the participants were forced to make the decision of risking the money they had already earned to pump the balloon bigger.
“If you’re risk-averse, you may pump a few times and then decide to cash out because you don’t want the balloon to burst and lose your money.
“But for those who are on acetaminophen, as the balloon gets bigger, we believe they have less anxiety and less negative emotion about how big the balloon is getting and the possibility of it bursting.”
In a further study, 545 undergraduate students were given doses of paracetamol before taking part in tasks that measured risk behaviour.
These were exercises such as driving without a seat belt, stealing and using drugs and alcohol.
A previous study found that paracetamol could be no more effective than a placebo pill for common injuries and illnesses.
Writing in the Medical Journal of Australia, in April 2021, researchers based at the University of Sydney found that the common painkiller is most ineffective when taken for acute back pain.
The experts stated: “While paracetamol is widely used, its efficacy in relieving pain has been established for only a handful of conditions, and its benefits are often modest.
“High or moderate quality evidence that paracetamol (typically 0.5–1g, single or multiple doses) is superior to placebo for relieving pain was available for only four of 44 painful conditions examined.”
Another study on the pills found that ‘hidden’ ingredients could increase your risk of a heart attack or early death.
Most people will be unaware that salt is sometimes added to paracetamol to help it break down in water.
But researchers at Xiangya Hospital, Central South University, Changsha, China, estimate that 170 out of every 10,000 adults in the UK use salt-containing medication.
Lead researcher Professor Chao Zeng said: “People should pay attention not only to salt intake in their food but also not overlook hidden salt intake from the medication in their cabinet.
“Our results suggest re-visiting the safety profile of effervescent and soluble paracetamol.”
In those with high blood pressure (hypertension), the risk of heart attack, stroke or heart failure after one year was 5.6 per cent in the salt-paracetamol group.
This compared to 4.6 per cent in those with hypertension taking non-sodium-containing paracetamol, according to the findings published in the European Heart Journal.
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