· Viagra Descriptions Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines .They include dutasteride Avodart, Jalyn and finasteride Propecia, Proscar. Oral medicine for ED also might not be safe or work well if you have: Very low blood pressure, called hypotension, or uncontrolled high blood pressure, called hypertension. Talk to your doctor about eating grapefruit and drinking grapefruit juice while taking this medicine. You can take it in a small dose daily or in a larger dose as needed. This will increase the supply of blood to the lungs and reduce the workload of the heart. When hypertension occurs in the lungs, the heart must work harder to pump enough blood through the lungs. You should only be treated with one of these products at a time.It’s a prescription drug that’s used in adult males* with ED. With ED, you have trouble getting or keeping an erection. To find out more about how Viagra is used .  · Viagra Descriptions Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines . Why is this medication prescribed? Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men.Some examples of nitrates are nitroglycerin Nitro-Dur, Nitrostat, others , isosorbide mononitrate Monoket and isosorbide dinitrate Bidil. Sildenafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow easily. They’re often the first line of treatment for trouble getting or keeping an erection, called erectile dysfunction ED. As with sildenafil, a high-fat meal or alcohol keep the body from absorbing it as quickly. If you are taking sildenafil for erectile dysfunction, your doctor will probably start you on an average dose of sildenafil and increase or decrease your dose depending on your response to the medication. Sildenafil is also used in both men and women to treat the symptoms of pulmonary arterial hypertension.