The article was written by Pharmacist, Master Pham Thi Kim Dung - Faculty of Pharmacy - Vinmec Times City International General Hospital. Tylenol (acetaminophen) is a pain reliever and fever reducer. Tylenol is used to treat many ailments such as headaches, muscle aches, arthritis, backaches, toothaches, sore throats, colds, flu, and fevers.