Estradiol hexahydrobenzoate/hydroxyprogesterone caproate/testosterone hexahydrobenzoate (EHHB/OHPC/THHB), sold under the brand name Trinestril AP, is an injectable

combination medication A combination drug is a combination of two or more pharmaceutical drugs as active ingredients combined into a single dosage form, typically as a ''fixed-dose combination'', with each constituent standardized to specifications of a fixed dose. Fix ...

of estradiol hexahydrobenzoate (EHHB), an

estrogen Estrogen (also spelled oestrogen in British English; see spelling differences) is a category of sex hormone responsible for the development and regulation of the female reproductive system and secondary sex characteristics. There are three ...

hydroxyprogesterone caproate Hydroxyprogesterone caproate, sold under the brand name Delalutin among others, is a medication used to reduce the risk of preterm birth in women pregnant with one baby who have a history of spontaneous preterm birth. In March 2023, the manuf ...

(OHPC), a

progestogen Progestogens, also sometimes written progestins, progestagens or gestagens, are a class of natural or synthetic steroid hormones that bind to and activate the progesterone receptors (PR). Progesterone is the major and most important progestoge ...

, and testosterone hexahydrobenzoate (THHB), an

androgen An androgen (from Greek ''andr-'', the stem of the word meaning ) is any natural or synthetic steroid hormone that regulates the development and maintenance of male characteristics in vertebrates by binding to androgen receptors. This includes ...

anabolic steroid Anabolic steroids, also known as anabolic-androgenic steroids (AAS), are a class of drugs that are structurally related to testosterone, the main male sex hormone, and produce effects by binding to the androgen receptor (AR). Anabolism, Anaboli ...

. It contained 3 mg EHHB, 75 mg OHPC, and 100 mg THHB and was administered by

intramuscular injection Intramuscular injection, often abbreviated IM, is the medical injection, injection of a substance into a muscle. In medicine, it is one of several methods for parenteral, parenteral administration of medications. Intramuscular injection may be ...

once per month. The medication was marketed by 1957.

References

Abandoned drugs Combined estrogen–progestogen–androgen formulations {{Genito-urinary-drug-stub

See also

References