When used correctly, acetaminophen (the active ingredient in Tylenol) is safe and effective with a lower risk of stomach upset than other over-the-counter pain relievers. However, acetaminophen overuse is also the most common cause of liver failure in the United States. Many people are unaware that acetaminophen is found in many over-the-counter and prescription drugs. Some examples include Excedrin, NyQuil, cough and cold medicines, Vicodin, Percocet, and Fioricet. It is very important to read the active ingredients in all over-the-counter drugs and to ask if your prescription pain medications contain acetaminophen. Your local pharmacist can recommend the maximum amount of these medications that can safely be taken daily.
Tylenol: Use as Directed