Estradiol (medication)
, estradiol is available in the United States in the following forms:Oral estradiol valerate (Progynova) and other esters of estradiol that are used by injection like estradiol benzoate, estradiol enantate, and estradiol undecylate all are not marketed in the U.S. Polyestradiol phosphate (Estradurin) was marketed in the U.S. previously but is no longer available.
Pharmacokinetics of progesterone
Progesterone does not appear to be available pharmaceutically in the form of subcutaneous pellet implants. This is in contrast to estradiol and testosterone. Progesterone may be available in the form of subcutaneous pellet implants from some compounding pharmacies however. Such products are not regulated for quality or effectiveness however. Subcutaneous implantation of progesterone has been studied in animals. Although progesterone is not available for subcutaneous implantation as a pharmaceutical product, subcutaneous implants of progestins, such as etonogestrel (Implanon/Nexplanon) and levonorgestrel (Jadelle/Norplant), are available as pharmaceutical preparations. They are used specifically as a form of long-lasting hormonal birth control.