In 6 postsurgery patients with T tubes inserted in their common bile ducts, biliary excretion of paracetamol amounted to 2.6% of an oral dose (1 g), consisting of unchanged paracetamol (0.57%) and conjugates of sulfate (0.36%), glucuronic acid (0.36%) and cysteine (1.63%). Renal recovery in the same patients was 35.3%, consisting of 2.6% unchanged paracetamol, 12.7% paracetamol sulfate, 9.0% glucuronide, 3.9% cysteine conjugate and 4.0% mercapturate.
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Siegers et al. (2008) studied this question.