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Compared to MPA, medroxyprogesterone is over two orders of magnitude less potent as a progestogen. [8] Medroxyprogesterone is also notable in that it is a minor metabolite of MPA. [9] In addition to its progestagenic activity, medroxyprogesterone is a weak antiandrogen in vitro on human androgen receptor. [10]
[2] [3] As opposed to combined injectable contraceptives, they contain only a progestogen without an estrogen, and include two progestin preparations: [2] [3] Medroxyprogesterone acetate (brand names Depo-Provera, Provera, Depo-subQ Provera 104) [ 4 ] – 150 mg ( intramuscularly ) or 104 mg ( subcutaneously ) every 3 months [ 3 ]
Medroxyprogesterone acetate (MPA), also known as depot medroxyprogesterone acetate (DMPA) in injectable form and sold under the brand name Depo-Provera among others, is a hormonal medication of the progestin type. [10] [4] It is used as a method of birth control and as a part of menopausal hormone therapy.
The most common form of sterilization in dogs and cats is surgical, spaying in females and castration in males. Non-surgical fertility control can either result in sterilization or temporary contraception and could offer a cheaper way to keep wild dog and cat populations under control. As of 2019, only contraceptives are commercially available.
When used on females, the effects are similar, though there is little research about chemically lowering female's sex drive or female-specific anaphrodisiacs, since most research focuses on the opposite, but anti-androgenic hormone regimens would lower testosterone in females which can impact sex drive or sexual response.
The progestogens are named for their function in maintaining pregnancy (i.e., progestational), although they are also present at other phases of the estrous and menstrual cycles. [ 2 ] [ 3 ] The progestogens are one of three types of sex hormones , the others being estrogens like estradiol and androgens / anabolic steroids like testosterone .
Polyestradiol phosphate/medroxyprogesterone acetate (PEP/MPA) is a combination of polyestradiol phosphate (PEP), an estrogen, and medroxyprogesterone acetate (MPA), a progestin, which was studied in the 1960s as a long-lasting combined injectable contraceptive for women but was never marketed.
Medroxyprogesterone acetate (Amen, Curretab, Cycrin, Provera) – 2.5 mg, 5 mg, 10 mg; Megestrol acetate (Megace) – 20 mg, 40 mg – approved specifically for the treatment of breast and endometrial cancer [46] and for the treatment of anorexia, cachexia, and weight loss in patients with AIDS Tooltip acquired immunodeficiency syndrome [47]