Popping Tylenol to soothe an ache is second nature to many of us. But what do you take for heartache? A new pair of studies suggests that the painkiller might blunt responses to emotional pain, too. In one study, researchers from the Ohio State University Medical Center gave 80 people either a placebo or 1,000 mg of acetaminophen —the active ingredient in Tylenol and the equivalent of two extra-strength Tylenol.