Formestane

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Formestane
Systematic (IUPAC) name
(8R,9S,10R,13S,14S)-4-hydroxy-10,13-dimethyl- 2,6,7,8,9,11,12,14,15,16-decahydro-1H- cyclopenta[a]phenanthrene-3,17-dione
Identifiers
CAS number	566-48-3
ATC code	L02BG02
PubChem	11273
Chemical data
Formula	C19H26O3
Mol. mass	302.408 g/mol
Pharmacokinetic data
Bioavailability	?
Metabolism	?
Half life	?
Excretion	?
Therapeutic considerations
Pregnancy cat.	?
Legal status
Routes	?

Formestane belongs to a class of drugs known as aromatase inhibitors. It is used in the treatment of estrogen-receptor positive breast cancer in post-menopausal women. It is available as an intramuscular depot injection (Lentaron).

Formestane is often used to suppress estrogen production from anabolic steroids or prohormones. It also acts as a prohormone to 4-hydroxytestosterone, an active steroid which displays weak androgenic activity in addition to acting as a mild aromatase inhibitor.

Formestane has poor oral bioavailability and as such is no longer popular as many orally available aromatase inhibitors have been developed.

v • d • e Sex hormones and related agents (primarily G03, also L02, H01C) - human endogenous in CAPS Progestogens: (receptor) PROGESTERONE,Dienogest, Desogestrel, Drospirenone, Dydrogesterone, Ethisterone, Etonogestrel, Ethynodiol diacetate, Gestodene, Gestonorone, Levonorgestrel, Lynestrenol, Medroxyprogesterone, Megestrol, Norelgestromin, Norethisterone, Norethynodrel, Norgestimate, Norgestrel, Norgestrienone, Tibolone Selective progesterone receptor modulator: Asoprisnil, CDB-4124 Antiprogestogen: Mifepristone Androgens: (receptor) TESTOSTERONE, Androstanolone, Fluoxymesterone, Mesterolone, Methyltestosterone, (see also anabolic steroids) Antiandrogens: Bicalutamide, Cyproterone, Dienogest, Flutamide, Nilutamide, Spironolactone Estrogens: (receptor) ESTRADIOL, ESTRIOL, ESTRONE, Chlorotrianisene, Dienestrol, Diethylstilbestrol, Ethinylestradiol, Fosfestrol, Mestranol, Polyestradiol phosphate Selective estrogen receptor modulator: Afimoxifene, Arzoxifene, Bazedoxifene, Clomifene, Fulvestrant, Lasofoxifene, Raloxifene, Tamoxifen, Toremifene Aromatase inhibitor: Aminogluthetimide, Anastrozole, Atamestane, Exemestane, Formestane, Letrozole, Vorozole Gonadotropins: (FSHR/LHCGR) ovulation stim.: Clomifene, Urofollitropin Antigonadotropins: Danazol, Gestrinone GnRH: (receptor) agonist: Buserelin, Goserelin, Histrelin, Leuprorelin, Nafarelin, Triptorelin antagonist: Abarelix, Cetrorelix, Ganirelix