Clascoterone is a topical antiandrogen that has demonstrated effectiveness in the treatment of acne in both males and females and is currently in the late stages of clinical development. It has shown no systemic absorption or associated antiandrogenic side effects. In a direct head-to-head comparison, clascoterone showed greater effectiveness than topical isotretinoin. 5α-Reductase inhibitors such as finasteride and dutasteride may be useful for the treatment of acne in both males and females but have not been adequately evaluated for this purpose. Moreover, 5α-reductase inhibitors have a strong potential for producing birth defects in male babies and this limits their use in women. However, 5α-reductase inhibitors are frequently used to treat excessive facial/body hair in women and can be combined with birth control pills to prevent pregnancy. There is no evidence as of 2010 to support the use of cimetidine or ketoconazole in the treatment of acne.