It has 150 mg of sildenafil citrate, the active component of several ED medications that have FDA approval.It increases sexual activity by improving blood circulation in the male genitals because it is a PDE5 inhibitor. In summary, it increases erection by improving internal blood circulation, but it requires sexual stimulation.A red pill called Fildena 150 mg is used to treat male erectile dysfunction. Men who suffer from erectile dysfunction or impotence are unable to acquire and sustain the desired hardness.They are therefore unable to penetrate as anticipated. Oral medications such as Fildena 150 reduce these symptoms and enhance sex in general.