In this report, we studied the effect of sub-lethal doses (20mg, 30mg, 100mg, 200mg and 300mg/Kg body weight) and duration of acetaminophen given intraperitoneally (i.p) to male albino rats; on the level of pc methaemoglobin and some liver function tests: Alkaline phosphatase, free and conjugated bilirubin. The study showed that the increase in pc methaemoglobin, free and conjugated bilirubin in rats treated with acetaminophen are significantly (P less than 0.05) greater than those for the control rats and that the measured parameters increase with acetaminophen concentrations. The results also show that the free bilirubin is probably displaced from plasma albumin.
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