Filed Under: Costs, Patients, Providers. Viagra sildenafil citrate was approved by the Food and Drug Administration for use in erectile dysfunction in It is sold in 20, 40, 60, 80 and mg sizes. In ...

Viagara can take about a half hour to start working and may work for a couple of hours, or longer, depending on certain factors, including your metabolism. Sildenafil is a common medication used to ...