<p>Testosterone is the principal endogenous hormone essential for normal growth and development of the male sex organs and male secondary sex characteristics. During adult life testosterone is essential for the functioning of the testes and accessory structures and for the maintenance of libido, sense of well-being, erectile potency, prostate and seminal vesicle function.<br />
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Treatment of hypogonadal men with Testanon results in a clinically significant rise of plasma concentrations of testosterone, dihydrotestosterone and androstenedione, as well as a decrease of SHBG (sex hormone binding globulin). In males with primary (hypergonadotropic) hypogonadism treatment with Testosterone Decanoate results in a normalization of gonadotropin levels. Treatment of female-to-male transsexuals with Testosterone Decanoate results in a clinically significant rise of plasma testosterone levels, a decrease of LH and FSH levels and a decrease in SHBG level.</p>