By Pat Anson, Editor

A popular over-the-counter pain reliever may do more than just relieve minor aches and pains. Ohio State researchers say acetaminophen -- the active ingredient in Excedrin and hundreds of other pain medications -- can also make us feel less empathy for the physical and emotional pain of others.

"We don't know why acetaminophen is having these effects, but it is concerning," says Baldwin Way, an assistant professor of psychology at Ohio State’s Wexner Medical Center's Institute for Behavioral Medicine Research.

“Empathy is important. If you are having an argument with your spouse and you just took acetaminophen, this research suggests you might be less understanding of what you did to hurt your spouse's feelings."

Acetaminophen -- also known as paracetamol – is the world’s most widely used over-the-counter pain reliever. The study findings were published in the journal Social Cognitive and Affective Neuroscience.