Acetaminophen is the most common drug ingredient in the United States and is found in more than 600 different prescriptions and over-the-counter medicines, including pain relievers, fever reducers, and sleep aids as well as cough, cold, and allergy medicines. Over 50 million Americans use a medicine that contains acetaminophen each week. It is safe and effective when used as directed, but taking more than directed is an overdose and can lead to liver damage. The U.S. Food and Drug Administration (FDA) recommends taking no more than 4,000 milligrams (mg) of acetaminophen in a 24-hour period.   Here are four important […]