Generic name: sildenafil (oral) [ sil-DEN-a-fil ] Brand names: Revatio, Viagra. Drug classes: Agents for pulmonary hypertension, Impotence agents. Medically reviewed by .This medicine works best when you take it on an empty stomach an hour before sex. Oral ED medicines might not work or might be dangerous if you also take any of the following: Nitrate medicines. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. Erectile dysfunction is a condition where the penis does not harden and expand when a man is sexually excited, or when he cannot keep an erection. Tell your doctor if any of these symptoms are severe or do not go away: headache. Also tell your doctor if you have or have ever had pulmonary veno-occlusive disease PVOD; blockage of veins in the lungs ; a stomach ulcer; heart, kidney, or liver disease; a heart attack; heart failure; angina chest pain ; an irregular heartbeat; a stroke; chest pain; high or low blood pressure; high cholesterol; a bleeding disorder; blood circulation problems; blood cell problems such as sickle cell anemia a disease of the red blood cells , multiple myeloma cancer of the plasma cells , or leukemia cancer of the white blood cells ; conditions affecting the shape of the penis e. Sildenafil is also used in both men and women to treat the symptoms of pulmonary arterial hypertension.AdTake Charge of Your Sexual Health with Our Top-Rated Male Enhancement Products! Trust Our Unbiased Reviews and Improve Your Sexual Health in Confidence! Products and services Erectile dysfunction: Viagra and other oral medications By Mayo Clinic Staff Medicines that you take by mouth are called oral medicines. They’re often the . Generic Viagra (sildenafil) is an alternative to the branded Viagra drug that can be used for treating erectile dysfunction (ED). It’s now sold by many manufacturers, including .Sildenafil Viagra. Talk to your doctor about eating grapefruit and drinking grapefruit juice while taking this medicine. Sexual activity may be a strain on your heart, especially if you have heart disease. Ask your pharmacist or doctor for a copy of the manufacturer’s information for the patient. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. When a man is sexually stimulated, his body’s normal response is to increase blood flow to his penis to produce an erection. Sildenafil is also used in both men and women to treat the symptoms of pulmonary arterial hypertension.

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