Flutamide

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Flutamide is a nonsteroidal antiandrogen. It has been administered to transgender women in a number of studies/publications.[1][2][3] It is used for the treatment of hirsutism at dosages ranging from 62.5 mg/day to 500 mg/day and both alone and in combination with oral contraceptives.[4] The overall quality of the evidence for hirsutism is regarded as moderate.[5] Flutamide may be more effective than other antiandrogens like spironolactone, cyproterone acetate, and finasteride for this indication.[5]

Flutamide has a relatively high risk of elevated liver enzymes and hepatotoxicity and has been associated with many cases of severe hepatotoxicity, including deaths.[6][7][8][9][10] The risk is substantially higher than with other nonsteroidal antiandrogens like bicalutamide and nilutamide.[9] Because of its high risk of hepatotoxicity, flutamide has been recommended against for the treatment of androgen-dependent conditions like acne and hirsutism in cisgender women.[7][5][11]

Low or ultra-low doses of flutamide have been reported to lack hepatotoxicity.[12][13][14][15] However, other studies have had very different findings.[16][17][18] In addition, many case reports of severe hepatotoxicity at low or ultra-low doses exist, including deaths.[19][8][20][21]

Studies

Cisgender women

It has been evaluated in the treatment of androgen-dependent conditions like acne, seborrhea, hirsutism, alopecia, and hyperandrogenism (e.g., due to polycystic ovary syndrome) in cisgender women in over 100 clinical studies.[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96][97][98][99][12][100][101][102][13][14][103][104][105][106][107][108][15][109][110][111][112][113][16][114][115][116][117][118][18][119][120]

References

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  2. Falivene, M. R., Cuttica, C. M., Valenti, S., & Guido, R. (1995). Androgen receptor blockade with flutamide increases GH secretion in male-to-female transsexuals. Journal of Endocrinological Investigation, 18, 56-56.
  3. Valenti, S., Fazzuoli, L., & Giusti, M. (2003). Circulating nitric oxide levels increase after anti-androgen treatment in male-to-female transsexuals. Journal of endocrinological investigation, 26(6), 522-526.
  4. Generali, J. A., & Cada, D. J. (2014). Flutamide: hirsutism in women. Hospital pharmacy, 49(6), 517.
  5. 5.0 5.1 5.2 Somani, N., & Turvy, D. (2014). Hirsutism: an evidence-based treatment update. American journal of clinical dermatology, 15(3), 247-266.
  6. Wysowski, D. K., & Fourcroy, J. L. (1996). Flutamide hepatotoxicity. The Journal of urology, 155(1), 209-212.
  7. 7.0 7.1 Giorgetti, R., di Muzio, M., Giorgetti, A., Girolami, D., Borgia, L., & Tagliabracci, A. (2017). Flutamide-induced hepatotoxicity: ethical and scientific issues. Eur Rev Med Pharmacol Sci, 21(1 Suppl), 69-77.
  8. 8.0 8.1 Brahm, J., Brahm, M., Segovia, R., Latorre, R., Zapata, R., Poniachik, J., ... & Contreras, L. (2011). Acute and fulminant hepatitis induced by flutamide: case series report and review of the literature. Annals of hepatology, 10(1), 93-98.
  9. 9.0 9.1 Thole, Z., Manso, G., Salgueiro, E., Revuelta, P., & Hidalgo, A. (2004). Hepatotoxicity induced by antiandrogens: a review of the literature. Urologia internationalis, 73(4), 289-295.
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  85. Ibanez, L., & de Zegher, F. (2003). Low‐dose combination of flutamide, metformin and an oral contraceptive for non‐obese, young women with polycystic ovary syndrome. Human Reproduction, 18(1), 57-60.
  86. Ibanez, L., & de Zegher, F. (2003). Flutamide-metformin therapy to reduce fat mass in hyperinsulinemic ovarian hyperandrogenism: effects in adolescents and in women on third-generation oral contraception. The Journal of Clinical Endocrinology & Metabolism, 88(10), 4720-4724.
  87. Sahin, I., Serter, R., Karakurt, F., Demirbas, B., Guler, S., Culha, C., ... & Aral, Y. (2003). Leptin levels increase during flutamide therapy in women with polycystic ovary syndrome. Hormone Research in Paediatrics, 60(5), 232-236.
  88. Ibanez, L., Ong, K., Ferrer, A., Amin, R., Dunger, D., & de Zegher, F. (2003). Low-dose flutamide-metformin therapy reverses insulin resistance and reduces fat mass in nonobese adolescents with ovarian hyperandrogenism. The Journal of Clinical Endocrinology & Metabolism, 88(6), 2600-2606.
  89. Gambineri, A., Pelusi, C., Genghini, S., Morselli‐Labate, A. M., Cacciari, M., Pagotto, U., & Pasquali, R. (2004). Effect of flutamide and metformin administered alone or in combination in dieting obese women with polycystic ovary syndrome. Clinical endocrinology, 60(2), 241-249.
  90. Ibanez, L., & de Zegher, F. (2004). Ethinylestradiol-drospirenone, flutamide-metformin, or both for adolescents and women with hyperinsulinemic hyperandrogenism: opposite effects on adipocytokines and body adiposity. The Journal of Clinical Endocrinology & Metabolism, 89(4), 1592-1597.
  91. Sahin, I., Serter, R., Karakurt, F., Demirbas, B., Culha, C., Taskapan, C., ... & Aral, Y. (2004). Metformin versus flutamide in the treatment of metabolic consequences of non-obese young women with polycystic ovary syndrome: a randomized prospective study. Gynecological endocrinology, 19(3), 115-124.
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