Viagra (sildenafil): Side effects, dosage, how long it lasts
Viagra (sildenafil): Side effects, dosage, how long it lasts Key facts. Sildenafil (Viagra) is a medicine used to treat erectile dysfunction (ED, also called impotence). Sildenafil works by helping to relax the blood vessels in the penis, allowing more blood to flow in and cause an erection. Viagra is used to treat erectile dysfunction (impotence) […]
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