Pancreatic islets contain calmodulin. The protein binds to a particulate fraction derived from the islets and stimulates adenylate cyclase activity in this subcellular fraction, both phenomena being activated by ionized calcium. A calcium-dependent stimulation of adenylate cyclase by endogenous calmodulin may contribute to the accumulation of adenosine 3',5'-monophosphate evoked by insulin releasing agents in the islet cells.

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In a multicentre study the safety and efficacy of 125 µg intramuscular injection of 15(S)15 methyl PGF , (Prostin 15M, Upjohn) was compared with ergometrine and controls who did not receive any oxytocic for prophylactic control of postpartum bleeding. The study included 441 patients. The duration of third stage was shortened to 6.1 minutes following ergometrine and to 3.5 minutes following Prostin 15M compared to 7.6 minutes in the control subjects. Similarly the blood loss during third stage was less (95.2 ml) in Prostin 15M treated group compared to the untreated control group (233.2 ml). Prostin 15M, when used prophylactically, was also better than ergometrine (154.0 ml) in controlling the blood loss during third stage of labour in normal vaginal delivery.

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