Deepening of the voice is defined as an androgenic or masculinizing effect. Anabolic/androgenic steroids with higher relative androgenicity such as testosterone, fluoxymesterone, and methandrostenolone, likewise, have a high tendency to produce voice changes when used in females. All anabolic/androgenic steroids are capable of altering the female voice given the right level of stimulation, however. To this point, vocal changes have been reported under therapeutic conditions with even mild anabolic substances such as oxandrolone and nandrolone. Care must be taken to monitor the voice during all AAS intake, as changes are often easily generated. Immediately discontinuing anabolic/androgenic steroids may reduce the severity of symptoms, although some changes are likely to persist. Anabolic/androgenic steroid use may, likewise, permanently alter vocal physiology in females.
Wlliam Llewellyn (2011) - Anabolics