Testsosterone implants contain 800 mg of testosterone (usually in the form of four 200 mg pellets). They are implanted into the buttocks or abdomen, and provide testosterone replacement for around six months. Implants are replaced periodically, once symptoms of testosterone deficiency recur. Inserting the testosterone pellets is a minor surgical procedure, requiring local anaesthetic ; this is the major limitation of this method of treatment. However, men using this form of testosterone replacement are usually satisfied with the method, and are more likely to continue being treated than men using other modes of testosterone replacement.
Primary hypogonadism (congenital or acquired): Testicular failure due to diseases and conditions in the body such as cryptorchidism, bilateral torsion, orchitis, vanishing testis syndrome, orchiectomy, Klinefelter Syndrome, chemotherapy, or toxic damage from alcohol or heavy metals; these men usually have low serum testosterone levels and gonadotropins (FSH, LH) above normal range Hypogonadotropic hypogonadism (congenital or acquired): Gonadotropin or luteinizing hormone-releasing hormone (LHRH) deficiency or pituitary-hypothalamic injury from tumors, trauma, or radiation; these men have low testosterone serum concentrations but have gonadotropins in the normal or low range.