Filitra 40 is a product related to erectile dysfunction (ED) treatment and follows a similar naming convention to other medications, it may contain Vardenafil as the active ingredient. Vardenafil is a phosphodiesterase type 5 (PDE5) inhibitor, just like Sildenafil (Viagra) and Tadalafil (Cialis). These medications work by enhancing the effects of nitric oxide, a natural chemical in the body that relaxes muscles in the penis.