The initiative will help patients using acetaminophen to reduce the risk of accidental overdose.
McNeil has informed the US Food and Drug Administration (FDA) that the new dosing instructions will appear on Extra Strength Tylenol product packages in the beginning of fall 2011.
McNeil will also be lowering the maximum daily dose for Regular Strength Tylenol and other adult acetaminophen-containing products beginning in 2012.
Acetaminophen, the active ingredient in Tylenol is also found in other over-the-counter (OTC) and prescription medications such as Sudafed Triple Action, NyQuil, Percocet and Vicodin.