A drug called Buy Fildena is used to treat erectile dysfunction (ED) in males. The drug’s active ingredient, sildenafil, belongs to a class of medications known as phosphodiesterase type 5 (PDE5) inhibitors.Sildenafil relaxes blood vessel smooth muscles, particularly those in the penis. An erection is the result of increased blood flow to the penile region during sexual stimulation. Part of the action involves blocking PDE5, the enzyme that breaks down cyclic guanosine monophosphate (cGMP). The way Fildena tablets function is by inhibiting PDE5, which causes blood vessel dilatation, increases cGMP levels, and promotes smooth muscle relaxation.