buy Viagra 200mg here viagra no prescription Some authors advocate measuring prolactin and free testosterone levels as part of the initial evaluation.4,5 The value of this routine testing is uncertain, however, because the incidence of endocrinopathy presenting as erectile dysfunction is reportedly only 2 percent.8 A reasonable strategy is to obtain a free testosterone level in all men aged 50 and older and in those younger than 50 who have symptoms or signs of hypogonadism such as decreased libido, bilateral testicular atrophy or a reduced amount of body hair.9 The prolactin level should be measured if the free testosterone level is low, the patient has a substantial loss of libido or a prolactinoma is suspected on the basis of a history of headache with visual field cuts.10 Measurement of luteinizing hormone levels can be reserved for use in distinguishing primary from secondary hypogonadism in men with low testosterone levels.9 If you need viagra canadian pharmacy viagra * Avoid working for long hours. Take a break from regular routine at week ends and spend time with your partner. The researchers found that the overall prevalence of erectile dysfunction among U.S. men was 18.4 percent. Age was a strong risk factor -- men 70 and older accounted for 70 percent of those with erectile dysfunction. In contrast, just 5 percent of men with erectile problems were between the ages of 20 and 40.