PDF] Evidence that Increased Acetaminophen use in Genetically Vulnerable Children Appears to be a Major Cause of the Epidemics of Autism, Attention Deficit with Hyperactivity, and Asthma Semantic Scholar Acetaminophen: Is Too Much of a Good Thing Too Much? Compendium of Continuing Education in Dentistry At *therapeutic* doses, what is the primary metabolic pathway for acetaminophen (paracetamol)? Phase II conjugation (glucuronidation and sulfation) Phase I oxidation by CYP3A4 Phase I oxidation by CYP2E1 Direct excretion by the Glutathione conjugate detection (liver S9, human) US 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