Acetaminophen (paracetamol), also commonly known as Tylenol, is the most commonly taken analgesic worldwide and is recommended as first-line therapy in pain conditions by the World Health Organization (WHO). It is also used for its antipyretic effects, helping to reduce fever. It is not safe to use more than 4 grams (4,000 milligrams) of acetaminophen in one day (24 hours), as this may increase the risk for serious liver problems. For Tylenol® Extra Strength, the maximum dose is 3,000 milligrams per 24 hours. Acetaminophen is used to relieve mild to moderate pain and to reduce fever. Acetaminophen is in a class of medications called analgesics (pain relievers) and antipyretics (fever reducers). Acetaminophen is used for the short-term relief of minor aches and pains due to colds, flu, headache, backache, arthritis, toothache, muscle pain, and menstruation. It also temporarily reduces fever. Outside of the United States, Canada, and Japan, acetaminophen is called paracetamol. Paracetamol, [a] or acetaminophen, [b] is an analgesic and antipyretic agent used to treat fever and mild to moderate pain. [14][15] It is a widely available over-the-counter drug sold generically or under various brand names, including Tylenol and Panadol. Acetaminophen is found in hundreds of over-the-counter and prescription drugs. It may be the only active ingredient, or it may be combined with other active ingredients. Acetaminophen is sold. Find patient medical information for Acetaminophen (Tylenol) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Detailed Acetaminophen dosage information for adults and children. Includes dosages for Pain and Fever; plus renal, liver and dialysis adjustments. Read labels and stick to guidelines to prevent this widely used pain and fever remedy from harming your liver. Cold, cough, and flu season is a good time to revisit the risks of acetaminophen - the pain and fever reliever in Tylenol and many other over-the-counter medications. Discover all you need to know about Acetaminophen, the active ingredient in TYLENOL®. Learn about different uses, how it works, different forms, precautions, and more.