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Erectile dysfunction can occur if one or more of these requirements are not met. The following are causes of erectile dysfunction: The FDA does not recommend alternative therapies to treat sexual function. Many products are advertised as "herbal viagra" or "natural" sexual enhancement products, but no clinical trials or scientific studies support the effectiveness of these products for the treatment of erectile dysfunction, and synthetic chemical compounds similar to sildenafil have been found as adulterants in many of these products. The United States Food and Drug Administration has warned consumers that any sexual enhancement product that claims to work as well as prescription products is likely to contain such a contaminant. Quitting smoking, exercising regularly, losing excess weight, curtailing excessive alcohol consumption, controlling hypertension, and optimizing blood glucose levels in patients with diabetes are not only important for maintaining good health but also may improve or even prevent erectile function. Some studies suggest that men who have made lifestyle improvements experience increased rates of success with oral medications. buy viagra online with prescription buy viagra online Buy cialis online viagra online paypal canada viagra online without prescription viagra online next day delivery uk viagra online Buy cialis online Treatment for erectile dysfunction on the NHS: The Department of Health states: "From 1 July 1999 only those patients suffering from one of the specified medical conditions are eligible to receive drug treatments for impotence on the NHS. Other men can receive a private prescription from their own GP." Men with a rare heart condition known as long QT syndrome should not take vardenafil since this may lead to abnormal heart rhythms. The QT interval is the time it takes for the heart's muscle to recover after it has contracted. The QT interval is measured with an electrocardiogram (EKG). Some people have longer than normal QT intervals, and they may develop potentially life-threatening abnormal heart rhythms, especially when given certain medications. Since long QT syndrome can be inherited, men with a family history of long QT syndrome should not take vardenafil. Furthermore, vardenafil is not recommended for men who are taking medications that can affect the QT interval such as quinidine (Quinaglute, Quinidex), procainamide (Pronestyl; Procan-SR; Procanbid), amiodarone (Cordarone), and sotalol (Betapace). Is the patient suffering from erectile dysfunction or from loss of libido or a disorder of ejaculation (for example, premature ejaculation)? Vardenafil should not be used with alpha-blockers, medicines used to treat high blood pressure and benign prostate hypertrophy (BPH), because the combination of vardenafil and an alpha-blocker may lower the blood pressure greatly and lead to dizziness and fainting. Examples of alpha-blockers include tamsulosin (Flomax), terazosin (Hytrin), doxazosin (Cardura), alfuzosin (Uroxatral), and prazosin (Minipress).