Fildena 150mg is a drug used to treat erectile dysfunction. Fildena 150mg is a prescription drug used to treat erectile dysfunction. Fildena 150mg helps maintain an erection by increasing blood flow in blood vessels. This medicine is taken 30 minutes or 1 hour before you have sex. You can take this medicine before or after food. Do not consume fatty foods or alcoholic beverages with this medicine as it slows down the effect of the medicine.