Halotestex (fluoxymesterone) is an oral derivative of the male hormone testosterone. Unlike testosterone, halotestex does not convert to estrogen. Therefore, estrogen-related side effects such as fat deposition, water retention, and gynecomastia do not occur. Halotestex has powerful androgenic properties. It is particularly noted for increased strength without significant additional weight gain. Side effects include aggression, oily skin, and virilization. Halotestex is considered to be very toxic to the liver, and thus must be used with caution and for short durations only. Halotestex has a release time of between 8-12 hours. Average dosages are 10mg-40mg per day.