Hello Thank you for trusting HCM Dear hyperprolactinemia induces hypogonadism by interfering with the secretion of gonadotropin-releasing hormone (GnRH) from the hypothalamus. The resulting decrease in serum T is believed to be the cause of the erectile dysfunction, although there may be an end-organ effect of prolactin on the penis. Surprisingly, not everyone with hyperprolactinemia has a low serum T level or complains of erectile dysfunction.However, when the serum prolactin is corrected in patients with an elevated prolactin level and a low serum T level, the serum T level usually returns to a normal value, and erectile function is usually restored (if erectile dysfunction was present). Simply treating the patient with exogenous T does not usually correct the erectile dysfunction (unless the prolactin levels are returned to normal). I think I answered to your question if you have more questions feel free to ask. Take care