Tadalafil Femalefil is a drug that is sometimes marketed as a treatment for female sexual dysfunction, similar to how tadalafil (found in Cialis) is used to treat erectile dysfunction in men. It works by increasing blood flow to the genital area, which may enhance sexual arousal and satisfaction. However, it is important to note that the safety and efficacy of this drug for women are not fully established, and it should only be used under the guidance of a healthcare provider.