Acetaminophen (Paracetamol) Toxicity A common and potentially fatal cause of acute liver failure due to toxic accumulation of the metabolite NAPQI when glutathione stores are depleted. Early recognition and timely administration TYLENOL [Aetaminophen] metabolism Cyp 3A4 and 2E1: CYP3A4 is the major Cytochrome P 450 [Cyp] enzyme that catalyzes acetaminophen oxidation into NAPQI in human Phase I liver detox. The other Cyp enzyme Acetaminophen metabolism Association between acetaminophen metabolites and CYP2E1 DNA methylation level in neonate cord blood in the Boston Birth Cohort Clinical Epigenetics Springer Nature Link Napqi hi res stock photography and images Alamy