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A measurement of luteinizing hormone (LH) and, in some instances, prolactin, may be helpful. A serum prolactin level is obtained if the patient has evidence of pituitary hyperfunction, a common endocrine cause of erectile dysfunction (ED), and in documented cases of low serum testosterone levels. LH levels vary according to the body's need for testosterone. The hypothalamus regulates testosterone levels by releasing or inhibiting LH-releasing hormone, which acts in the pituitary to produce LH. A high LH level associated with a low testosterone level implies primary testicular (Leydig cell) failure. Conversely, a low LH level associated with a low testosterone level suggests a central defect. Article, publication date, and citation information can be found at http://pharmrev.aspetjournals.org. What about an IUD? looking for generic viagra? canadian pharmacy viagra for sale online best drugstore where you can buy viagra buy viagra without prescription online An innovative drug-delivery system nanoparticles encapsulating nitric oxide or prescription drugs shows promise for topical treatment of erectile dysfunction (ED), according to a new study by scientists at Albert Einstein College of Medicine of Yeshiva University.