Tadalafil Femalefil is a medication that combines Tadalafil, the active ingredient used to treat erectile dysfunction (ED) in men, with a formulation targeted toward improving sexual function in women. It’s marketed as a potential treatment for female sexual dysfunction (FSD) or low libido in women, although its use and effectiveness in women are still under research. By inhibiting PDE5, Tadalafil helps improve circulation, making it easier for men to achieve and maintain an erection when sexually stimulated.