Micronized Progesterone Vaginal Pessary is structurally and biologically identical to natural progesterone.
Absorption: Vaginal administration of 400 mg progesterone every 12 hours in healthy women rapidly achieves and maintains serum progesterone levels appropriate for the mid-luteal phase and early pregnancy.
Distribution: Approximately 96–99% of progesterone binds to serum proteins, mainly albumin and corticosteroid-binding globulin.
Metabolism (Biotransformation): Progesterone is primarily metabolized by the liver into pregnanediols and pregnanolones, which are conjugated to glucuronide and sulfate metabolites. These metabolites excreted in bile may be deconjugated and further metabolized in the gut.
Elimination: Progesterone is excreted via the kidneys and bile.