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This section needs additional citations for verification. (May 2010) levitra viagra online buy viagra Drug therapy for erectile dysfunction: One drug in particular, sildenafil (‘Viagra’), has become an international phenomenon since its launch in the late 1990s because it’s one of the first drugs to offer a relatively simple safe drug treatment that helps the majority of men with erectile dysfunction – at least 70 per cent report improved erections. The drug does not directly give a man an erection but it works by boosting the natural mechanism that leads to an erection. When a man is sexually aroused, certain tissues in his penis relax, allowing blood to flow in and fill the penis. Viagra helps by elevating the levels of the chemical that causes the tissues to relax. These effects were discovered accidentally. The drug was originally developed to improve blood supply to the heart in angina sufferers. What will the future bring for erectile dysfunction? Combination therapy for the treatment of erectile dysfunction has been under investigation. Most of these studies have been small trials, and long-term data regarding their effectiveness and safety are lacking. However, with thorough evaluation and counseling, there may be a use for combination therapy for certain individuals with ED. buy propecia fda approved buy propecia online buy cialis online buy cialis online Aging. It is four times higher in men in their 60s than in men in their 40s buy cialis online Effectiveness of tadalafil in these studies was assessed using a sexual function questionnaire. Study participants also were asked if they were able to achieve vaginal penetration and to maintain erections long enough for successful intercourse. online pharmacy cialis arizona cialis online Before starting sildenafil for erectile dysfunction, a doctor may need to determine whether the heart can safely achieve the workload necessary for sexual activity. For example, in men with coronary artery heart disease, a doctor may perform a treadmill stress test to determine whether there is adequate blood supply to the heart muscle while exercising at levels comparable to sexual activity. Aging: There are two reasons why older men are more likely to experience erectile dysfunction than younger men. First, older men are more likely to develop diseases (such as heart attacks, angina, cardiovascular disease, strokes, diabetes mellitus, and high blood pressure) that are associated with erectile dysfunction. Second, the aging process alone can cause erectile dysfunction in some men, primarily by decreasing the compliance of the tissues in the corpora cavernosa, although it has been suggested, but not proven, that there is also decreased production of nitric oxide in the nerves that innervate the corporal smooth muscle within the penis.