Viagra.

Viagra (sildenafil) is supposed to be taken only by patients that have erectile dysfunction and are unable to have sex normally because of that problem. You can take Viagra only after you have discussed all the aspects of your treatment with your health care provider. It's important that you report any medical conditions you have or used to have, as many of them can require a dose adjustment. Tell your doctor about stomach ulcer, conditions affecting the shape of the penis, heart, kidney, or liver disease, bleeding disorder, diabetes, blood circulation problems, blood cell problems, irregular heartbeat, high or low blood pressure, stroke, chest pain, high cholesterol, pulmonary veno-occlusive disease, or a history of heart attack to see if any changes need to be made. Insomnia, muscle aches, flushing, changes in color vision, diarrhea, light sensitivity, nosebleeds, numbness, burning, or tingling, headache, and heartburn are mild side effects of Viagra, while such side effects as priapism, shortness of breath, sudden hearing loss, fainting, vision changes, sudden vision loss, irregular heartbeat, swelling in your hands, or chest pain must be reported to your doctor right away.