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  • Title: Effect of indomethacin and cyproheptadine on onset of labour in rats.
    Author: Weinstein D, Pfeifer Y, Sadovsky E, Polishuk WZ, Sulman FG.
    Journal: Arch Int Pharmacodyn Ther; 1977 Mar; 226(1):172-6. PubMed ID: 869638.
    Abstract:
    An attempt was made to postpone term in 59 pregnant rats by s.c. injections of indomethacin or cyproheptadine, or a combination of both. The cyproheptadine group gave birth to their litters on days 20-22, yet indomethacin postponed labour to the 23rd day, both when given alone or in combination with cyproheptadine. As the fourth saline group went into labour on the 20--23rd day the indomethacin postponement cannot be considered significant. Indomethacin being a prostaglandin antagonist and cyproheptadine a serotinin antagonist, it may be concluded that neither prostaglandin nor serotonin are decisive for the intricate process which triggers parturition. Other factors, such as decrease of progesterone, increase of oestrogen and perhaps foetal oxytocin, as well as placental ACTH, seem to concur in inducing labour, their effect being fortified by serotonin and prostaglandins during parturition.
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