The parent compounds of acetaminophen (US market in 1955 in the US as Tylenol and other products) were first discovered in 1886 (acetanilide) and 1887 (phenacetin). These were the earliest synthetic fever Illustration of the effects of acetaminophen on glutathione, Download Scientific Diagram Yes there is good evidence that acetaminophen (the active ingredient in Tylenol) can deplete glutathione under certain conditions. But whether that matters depends on dose, duration, and individual factors. Tylenol's Impact on Glutathione and Liver Damage Frontiers Potential adverse actions of prenatal exposure of acetaminophen to offspring Acetaminophen Induced Hepatotoxicity: a Comprehensive Update