Acetaminophen, also known as paracetamol and sold widely under the brand names Tylenol and Panadol, also increases risk-taking, according to a new study that measured changes in people’s behaviour when under the influence of the common over-the-counter medication.

“Acetaminophen seems to make people feel less negative emotion when they consider risky activities – they just don’t feel as scared,” says neuroscientist Baldwin Way from The Ohio State University.

“With nearly 25 percent of the population in the US taking acetaminophen each week, reduced risk perceptions and increased risk-taking could have important effects on society.”

The findings add to a recent body of research suggesting that acetaminophen’s effects on pain reduction also extend to various psychological processes, lowering people’s receptivity to hurt feelings, experiencing reduced empathy, and even blunting cognitive functions.