Fildena 25 is a medication used to treat men's erectile dysfunction. Sildenafil citrate is one of the ingredients of the medication. This medication is used to improve blood flow to the penis. Men over the age of 18 should take this medicine. Take this medication 45 minutes before sexual intercourse to allow for a more enjoyable experience with your partner. Fildena 25 has a 4- to 6-hour impact. This medication should be used only once per day. This medication should always be taken exactly as prescribed by your doctor.