Fildena 120 mg contains a comparative substance compound like other classes of Fildena drugs, which is Sildenafil Citrate. The main activity of the drug is to limit the protein phosphodiesterase within the divider of the blood vessels leading to the p*nis. As the size of the PDE5 protein increases, the cyclic monophosphate decreases. This cyclic monophosphate is responsible for dilating the courses provided by the penis. As cGMP builds up, blood progression expands, which uniquely helps in inciting cases.