CONCOMITANT USE WITH PROSTAGLANDINS INCREASES RISK OF UTERINE RUPTURE AND CERVICAL LACCERATIONS. USEFUL COMBINATION WITH ERGOTAMINE. SOME INHALATION ANAESTHETICS E.G. CYCLOPROPANE OR HALOTHANE, MAY ENHANCE THE HYPOTENSIVE EFFECT OF OXYTOCIN AND REDUCE ITS OXYTOCIC ACTION. THEIR CONCURRENT USE WITH OXYTOCIN HAS ALSO BEEN REPORTED TO CAUSE CARDIAC RHYTHM DISTURBANCES. WHEN GIVEN DURING OR AFTER CAUDAL BLOCK ANAESTHESIA, OXYTOCIN MAY POTENTIATE THE PRESSOR EFFECT OF SYMPATHOMIMETIC VASOCONSTRICTOR AGENTS.