What is Viagra? Viagra relaxes muscles found in the walls of blood vessels and increases blood flow to particular areas of the body. Viagra is used to treat erectile dysfunction (impotence) in men. Another brand of sildenafil is Revatio, which is used to treat pulmonary arterial hypertension and improve exercise capacity in men and women.Sorry something went wrong with your subscription Please, try again in a couple of minutes Retry. If you prefer, you may contact the U. Children 1 year of age and older weighing 20 to 45 kg—20 mg 3 times a day. The four main medicines taken by mouth for erectile dysfunction are: Avanafil Stendra. An inherited eye disease that affects the retina. These include itraconazole Sporanox, Tolsura , ketoconazole Extina, Ketozole, others and ritonavir Norvir.These medicines all work well for ED. When choosing one, tell your doctor or other health care professional what your preferences are, such as cost, ease of use, how long the drug’s effects last and side effects. Generic versions of sildenafil, vardenafil and tadalafil are available. CHOOSE BRAND-NAME VIAGRA. The original little blue pill prescribed by doctors for over 20 years. Clinically proven to treat men with erectile dysfunction (ED) Ongoing commitment to product quality and safety monitoring.  · For treatment of erectile dysfunction: For oral dosage form (tablets): Adults up to 65 years of age—50 milligrams (mg) as a single dose no more than once a day, 1 hour before sexual intercourse. Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse. Your doctor may adjust your dose if needed.You can take it in a small dose daily or in a larger dose as needed. If your dose is different, do not change it unless your doctor tells you to do so. Dosing The dose of this medicine will be different for different patients. If you see air bubbles in the syringe, repeat the steps. Severe liver disease. Generic versions of sildenafil, vardenafil and tadalafil are available.

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