In 2011, Tylenol's parent company officially lowered the maximum dosage on its extra strength acetaminophen products to 3,000 milligrams from 4,000 milligrams per day, according to CBS News, and Tylenol's website includes dosing charts for both children and adults. In 2014, the Food and Drug Administration recommended that medical professionals no longer give patients drug products that have more than 325 milligrams of acetaminophen in each dose because of the risk of liver injuries.
Acetaminophen is a pain reliever and fever reducer, according to WebMD. For infants and small children, the medication is packaged as a liquid suspension and given according to the child's age and weight while older children can use chewable tablets, according to Tylenol's website. In all cases, children under the age of 11 are only supposed to take five doses of the medication in a 24-hour period. In adults, the medication is packaged in tablets of 325, 500 and 650 milligrams. The maximum dose of 10 325-milligram tablets in 24 hours results in a total dose of 3,250 milligrams.
Overdoses of acetaminophen result in 200 deaths per year and are the leading cause of liver failure, according to CBS News. In severe cases, acetaminophen overdose results in liver failure and can necessitate liver transplants, according to the Food and Drug Administration. Overdoses can occur when patients do not realize they are taking more than one medication that contains acetaminophen, such as Nyquil, Sudafed or Vicodin, according to CBS News.