Fildena 100 mg is a Phosphodiesterase Type 5 (PDE5) inhibitor containing Sildenafil Citrate. The penile muscles relax and the blood vessels dilate as the cGMP level rises. Because the blood vessels dilate, blood may readily flow into the penis, resulting in a solid erection. Whether or not sexual stimulation is required to achieve a strong erection. Sildenafil 100 mg may have a half-life of four hours. The medication's effectiveness peaks roughly 60 minutes after ingestion when the level of Fildena in the blood rises.