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Following oral administration in laboratory animals, 4 -aminophenol is well absorbed, while dermal administration in laboratory animals is significantly less. Further data on dermal absorption for risk assessment purposes is in the human data section. When absorbed orally, the substance is excreted in the urine, primarily as acetaminophenol, acetamido glucuronide and acetamidophenyl glucuronide and to a lesser extent as aminosulfate and free 4 -aminophenol. When applied dermally, in vivo and in vitro studies in a human skin model (Episkin) indicate that the primary metabolites are acetaminophenol (paracetamol or APAP) and the sulfate conjugate of acetaminophenol. No data on inhalation bioavailability or pharmacokinetics could be identified.