Sildenafil is the first phosphodiesterase type 5 inhibitor (PDE-5), used in the management of erectile dysfunction (ED). The effectiveness and safety of the original drug have been studied most extensively among ED medications. Sildenafil has been successfully used for ED of different etiology and severity. To date, this PDE-5 remains the drug of choice for many patients with erectile dysfunction.

Keywords: erectile dysfunction, effectiveness, sildenafil, safety