The medication Fildena 100 mg is used for treating Erectile dysfunction in men. It is an FDA-approved drug. Fildena 100 mg is a fast-acting medication that lasts up to four hours. The drug improves your sexual virility, giving you the strength to erection when you fall in love. Almost every adult male has to deal with the problem of being unable to erect. Patients with erectile dysfunction can take a drug called Fildena.