Figure 5. Urinary prostaglandin excretion 2.5 h before ([white square]) and 2.5 h after ([black square]) acetaminophen administration (200 and 300 mg/kg given intraperitoneally; n = 4 and n = 5, respectively). There was no significant alteration in urinary prostaglandin excretion after acetaminophen injection. Data are given as the mean prostaglandin amount per hour +/- SD for the collection period of 2.5 h.