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Cholestasis and changes of portal pressure caused by chlorpromazine in the perfused rat liver

Chlorpromazine (10 μmol/L) causes a marked increase in portal pressure in perfused rat liver. Simultaneously, oxygen consumption, hepatic clearance of taurocholate and bile flow are diminished. These effects are prevented by the cyclooxygenase inhibitors indomethacin (15 μmol/L), acetylsalicylate (3 mmol/L) or ibuprofen (200 μmol/L). On addition of chlorpromazine the liver releases increased amounts of prostaglandin D2; this increase does not occur in the presence of indomethacin.