(+)-Fluprostenol (AL-5848), an analogue of prostaglandin F2 alpha, is a prostaglandin F2α receptor PTGFR agonist and decreases the expression of Oviductal glycoprotein 1 (OVGP1).

(+)-Fluprostenol(s.c. to rats on day 18 of pregnancy) increased cervical creep, or softness, by the following day. Doses of (+)-Fluprostenol 100-fold larger were necessary to increase uterine contractions. (+)-Fluprostenol produced falls in serum progesterone concentrations, increases in 20 alpha-dihydroprogesterone concentrations, no changes in oestradiol or relaxin concentrations and a reduction in the ovarian human chorionic gonadotrophin binding capacity in vitro. (+)-Fluprostenol was less potent in inducing cervical softness when administered per vaginam, and a dose which produced softening in pregnant rats was ineffective in ovariectomized steroid-maintained pregnant or pro-oestrous rats[3].