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where to buy viagra buy viagra without prescription online An erection problem is the inability to get or maintain an erection that is firm enough for a man to have satisfactory intercourse. You may be unable to get an erection at all, or you may lose the erection during intercourse before you are ready. If the condition persists, the medical term is erectile dysfunction. aIstituto di Ricerche Farmacologiche 'Mario Negri', Milano, Italia; Nocturnal penile tumescence (NPT) Vascular reconstructive surgery is performed to improve the blood supply of the penis in attempts to improve a man's ability to get and maintain an erection. Because the procedure is technically difficult, costly and not always effective, it is very rarely performed. Stress and Erectile Dysfunction: - Stress is a contributing factor for hypertension, heart disease, diabetes and depression all of which are in turn causal factors for erectile dysfunction. Additionally, the penis needs an ample blood supply in order to achieve an erection. Stress constricts the blood vessels in the extremities, including the penis, prevent adequate blood flow. Emotional symptoms of excessive stress are impatience, irritability, and deterioration in personal hygiene and appearance. The behavioral changes observed by the excessive stress are eating disorders, increased smoking, appetite changes, and increased intake of alcohol and other drugs.