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online cialis sales buy cialis Sildenafil is used for the treatment of erectile dysfunction of either physical or psychological cause. It has been found to be effective in treating erectile dysfunction in men with coronary artery disease, diabetes mellitus, hypertension, depression, coronary artery bypass surgery, and men who are taking antidepressants and several classes of anti-hypertensives. buy viagra online store How Common Is Erectile Dysfunction? Failure to achieve an erection less than 20% of the time is not unusual and treatment is rarely needed. Failure to achieve an erection more than 50% of the time, however, generally indicates there is a problem requiring treatment. cialis generic online cialis generic url buy cialis Lifestyle: smoking is a key cause of erectile dysfunction. Smoking causes impotence because it promotes arterial narrowing. See also Tobacco and health. How Common Is Erectile Dysfunction? According to the National Institutes of Health, approximately 5% of 40-year-old men and between 15% and 25% of 65-year-old men experience ED on a long-term basis. Sildenafil is available as oral tablets at doses of 25, 50, and 100 mg. It should be taken approximately one hour before sexual activity. In some men, the onset of action of the drug may be as early as 11-20 minutes. Sildenafil should be taken on an empty stomach for best results since absorption and effectiveness of sildenafil can be diminished if it is taken shortly after a meal, particularly a meal that is high in fat. Treatment depends on the cause. Exercise, particularly aerobic exercise is an effective treatment for erectile dysfunction.[20][better source needed] viagra sale online buy viagra online prescriptions without prescriptions viagra viagra Blood glucose levels: Abnormally high blood glucose levels may be a sign of diabetes mellitus.