Fildena 150 mg is used to treat erectile dysfunction (ED) in men. this tablet contains sildenafil. Fildena 150 mg also goes by the name Generic Cialis. One of the ingredients in this medication, sildenafil, helps men's penile tissue relax. It takes 24 hours for this medication to start working. You can take this medication with or without food. This medicine is only for men who are at least eighteen years old. Take this medication as prescribed by a physician.