Fildena 25 is prescribed for men over the age of 18. It is an effective drug to treat erectile dysfunction. It improves blood flow in the penile area and helps in enjoying sexual intercourse. It improves erection and also helps in maintaining firm erection. There have been reports of visual defects in some patients. However, it is unlikely that these defects are caused by the drug. Some studies have found that the use of PDE5 inhibitors may lead to an increase in the risk of cardiovascular problems.