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Viagra contains an ingredient sildenafil citrate which has a selective affect. When in the blood stream this compound binds with certain chemicals which result in relaxing the muscle tissue in and around the penis. Increased blood flow causes the penile arteries to swell produce an erection. You must also understand that viagra on its own will not induce erection. Sexual stimulation is necessary. Viagra is FDA approved and safe to use. But like any medication it must be used under competent medical advise. If you have been diagnosed with ED and plan to use Viagra, consult your doctor and discuss your medical history in detail. This will determine the dose and duration of treatment. buy cheap viagra viagra cialis online pharmacy viagra going generic viagra and strokes
