Filitra 40 Mg belongs to the class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors, which work by enhancing the effects of nitric oxide, a chemical that relaxes smooth muscles in the penis during sexual stimulation. This relaxation allows increased blood flow, enabling an erection. Filitra 40 Mg contains vardenafil as its active ingredient, known for its efficacy in treating ED by improving erectile function.