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EFFECTS OF 5-HYDROXYTRYPTAMINE ON FERTILITY AND LUTEAL DEVELOPMENT FOLLOWING INTRAVAGINAL ADMINISTRATION IN THE RAT

Summary.: Intravaginal administration of 5HT was effective in terminating pregnancy when given after implantation in the rat, provided that the tampon was allowed to remain in the vagina for 4 hr or more. Complete antifertility efficacy was associated with a prevention or reversal of the increase in ovarian weight, which occurs in untreated rats between Days 12 and 17 of pregnancy, and correlates with enlargement of the CL. Data from hysterectomized, ovariectomized and progesterone-implanted rats indicated that the effect on CL was not a cause of the antifertility effect. Intravaginal administration of 5HT was found to lead to general systemic effects.