Androgen replacement therapy in the aging male

Beginning around age 40 years, men experience a decrease in testosterone level-referred to as "andropause"-and the pathophysiologic changes that accompany this decrease. Androgen replacement therapy, typically used for the treatment of senile hypogonadism, is evolving as a potential treatment of various other conditions related to testosterone loss, such as osteoporosis, sarcopenia, and even psychological symptoms. As with any treatment modality, certain patient factors are more predictive of success with minimal adverse effects, and consideration must be given to concomitant conditions. This article will provide a review of recent studies examining the effects of androgen supplementation and evaluate the purported benefits and potential risks of this therapy. Further research is anticipated to elucidate the most appropriate candidates, as well as other potential indications, for this treatment.