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Always follow the directions on your prescription label carefully.

Symptoms of a heart attack may include chest, shoulder, neck, or jaw pain; numbness of an arm or leg; severe dizziness, headache, nausea, stomach pain, or vomiting; fainting; or vision changes. Symptoms of a stroke may include confusion, vision or speech changes, one-sided weakness, or fainting. Contact your doctor or seek medical attention right away if you experience these symptoms. Viagra may rarely cause a prolonged (eg, more than 4 hours) or painful erection.

A total dose of 40 mg sildenafil was administered by four intravenous infusions.]