Prescribing-label excerpts
Hydroxyprogesterone Caproate
Reference for: Hydroxyprogesterone. Source presentation: injection. Source route: intramuscular.
The source label presents its clinical-pharmacology findings together. These selected passages retain the source’s study context; the full label provides the complete discussion.
Clinical pharmacology
Hydroxyprogesterone is a potent, long-acting, progestational steroid ester which transforms proliferative endothelium into secretory endothelium, induces mammary gland duct development, and inhibits the production and/or release of gonadotropic hormone; it also shows slight estrogenic, androgenic, or corticoid effects as well, but should not be relied upon for these effects.
In advanced adenocarcinoma of the uterine corpus, Hydroxyprogesterone Caproate Injection, USP in a dosage of 1,000 mg or more, one or more times each week, often induces regressive changes.
Absorption: Peak serum levels of hydroxyprogesterone caproate appeared after 3 to 7 days in non-pregnant female subjects following a single intramuscular injection of 1,000 mg hydroxyprogesterone caproate. The pharmacokinetics of the 250 mg dose of hydroxyprogesterone caproate has not been evaluated in a study.
Metabolism: The conjugated metabolites include sulfated and glucuronidated products. In vitro data indicate that the metabolism of hydroxyprogesterone caproate is predominantly mediated by CYP3A4 and CYP3A5.
Excretion: Both conjugated metabolites and free steroids are excreted in the urine and feces, with the conjugated metabolites being prominent.
Hepatic Impairment — The effect of hepatic impairment on the pharmacokinetics of hydroxyprogesterone caproate has not been evaluated.
Hydroxyprogesterone caproate is extensively metabolized and hepatic impairment may reduce the elimination of hydroxyprogesterone caproate.
Renal Impairment — The effect of renal impairment on the pharmacokinetics of hydroxyprogesterone caproate has not been evaluated.
Selected passages from the cited U.S. prescribing label. The studies concern the source product and populations named in each passage; they do not establish Walter-product bioequivalence, an approved indication, or the kinetics of another fixed combination. Tables and the full prescribing information remain available in the source.
Source: DailyMed: Hydroxyprogesterone Caproate — injection
Reference accessed . Label revision: 2026-06-12.
