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Contact SupplierThis medicine usually begins to work for erectile dysfunction within 30 minutes after taking it. It continues to work for up to 4 hours, although its action is usually less after 2 hours. Use only the brand of this medicine that your doctor prescribed. Different brands may not work the same way.Sildenafil is usually effective for around 4 hours. However, this does not mean a person will have an erection for this long. The erection should only occur when a person is aroused. If a person experiences an erection that lasts a long time or is painful, they should seek emergency medical attention.Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly.