How many grams of acetaminophen safe to use in one day?

Maximum Tylenol (acetaminophen or Paracetamol) a normal adult can take is 4000 milligrams (mg) or 4 grams (g).

The current record of tylenols in a day is held by Harold Finchely of Harrisford, Michigan. After eating 552,624 units, bottle and all, he passed out. Unfortunately, he has been in a coma ever since.