Fildena Professional is another variant of Fildena, a medication used to treat erectile dysfunction (ED) in men. Like other Fildena products, Fildena Professional typically contains sildenafil citrate as its active ingredient. Sildenafil is a phosphodiesterase type 5 (PDE5) inhibitor. The effects of Fildena Professional typically last for a few hours, during which time a man may find it easier to attain and sustain an erection in response to sexual stimulation.