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You need to be using Viagra (sildenafil citrate) if you have erectile dysfunction and are unable to perform sexually as a result of that diagnosis. Viagra is a PDE5 inhibitor that has been specially designed for the needs of people that are unable to have sex (male patients only) because of not enough blood entering the blood vessels. The following are medical conditions that must be reported to your health care provider before you start taking Viagra: recent stroke, eye problems, active stomach ulcers, sickle cell anemia, coronary artery disease, heart failure, very high or low blood pressure, penis conditions, kidney disease, blood system cancers, recent heart attack, bleeding disorders, or liver disease. In case you are taking certain barbiturates, nevirapine, certain antifungals, alpha blockers, efavirenz, medications for high blood pressure, cimetidine, seizure medications, beta blockers, erythromycin, other medications for erectile dysfunction, anticoagulants, or HIV protease inhibitors, as interactions have been reported. In case you purchase Viagra online (which is a very good way to save some money), make sure you read the label carefully to learn all the information necessary.