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Estradiol hexahydrobenzoate/hydroxyprogesterone caproate/testosterone hexahydrobenzoate , sold under the brand name Trinestril AP, is an injectable combination medication of estradiol hexahydrobenzoate , an estrogen, hydroxyprogesterone caproate , a progestogen, and testosterone hexahydrobenzoate , an androgen/anabolic steroid. It contained 3 mg EHHB, 75 mg OHPC, and 100 mg THHB and was administered by intramuscular injection once per month. The medication was marketed by 1957.

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