Home / Hair Loss Treatments / Future Potential Treatments / Cures for Hair Loss / RU 58841 RU 58841 Hair Loss Treatment Type: Antiandrogen Notes: This is a French drug which is not yet FDA approved which has been shown to be a highly effective local topical antiandrogen. The company that makes the drug has shut down its dermatological division and is no longer pursuing new drugs from that division including RU58841. It is unknown whether they will license the treatment to other companies. Technical: RU 58841 (C17H18N3O3F3) Molecular Weight = 369.352; C,55.28;H,4.91;N,11.38 RU 58841, a new specific topical antiandrogen: a candidate of choice for the treatment of acne, androgenetic alopecia and hirsutism. Local inhibition of sebaceous gland growth by topically applied RU 58841 Preliminary pharmacokinetics and metabolism of novel non-steroidal antiandrogens in the rat: relation of their systemic activity to the formation of a common metabolite.