Filitra works by inhibiting the action of PDE5, thereby increasing blood flow to the penis during sexual stimulation. This helps in achieving and maintaining an erection. The duration of action of Filitra typically lasts for about 4 to 6 hours, during which time it can help improve erectile function and sexual performance. Many men find Filitra effective in enhancing their ability to achieve and sustain erections, leading to more satisfying sexual experiences.