Journal of Clinical Endocrinology & Metabolism, Vol 48, 955-958, Copyright © 1979 by Endocrine Society

ARTICLES

Effects of androgen on sexual behavior in hypogonadal men

JM Davidson, CA Camargo and ER Smith

Despite the widespread use of androgen in the treatment of hypogonadal men, its efficacy in restoring sexual behavior to hypogonadal patients has not been established in appropriately controlled behavioral studies. Accordingly, testosterone enanthate or vehicle was injected once every 4 weeks im in a double blind experiment. The subjects were six adult males, aged 32-65 yr, two with gonadal failure and four with secondary hypogonadism. Two doses of testosterone (100 and 400 mg) were administered for approximately 5 months, with the treatments varied at random within and among subjects. Details of sexual activity and experience were followed by the use of daily logs. Frequencies of erections, including nocturnal erections and coitus, showed significant dose-related responses to androgen treatment which closely followed the fluctuations in the circulating testosterone level. As indicated by the Profile of Mood States test, behavioral responses did not appear to be mediated by changes in mood. We concluded that the stimulatory effects of testosterone on sexual activity are rapid, reliable, and not due to a placebo effect. To maintain plasma testosterone and adequate sexual function within normal levels, even high doses of testosterone enanthate should be given no less frequency than once every 3 weeks.

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