Taking that drug in life is erectile dysfunction-ED that is suffering from that disease. The drug helps in the treatment of erectile dysfunction-ED. fildena 100 works in the drug sildenafil. It works to get a constant refill when you take the medicine. It is considered a favorite drug for people. Take Sildenafil at least 30 minutes, but no more than 4 hours before sexual activity. 1 hour before is most effective. That medicine helps more men.