Fildena 25 is a member of the phosphodiesterase type 5 inhibitors pharmacological class. The way Fildena 25 functions is by boosting blood flow to the penis. This aids in erection initiation and maintenance. For ED, fildena 25 only functions when you're sexually stimulated. You can take Fildena 25 with or without food. It is not recommended to take Fildena 25 for ED more than once per 24 hours. It is generally not recommended to take Fildena 25 more than once per 24 hours. Avoid stopping Fildena 25 without first consulting your physician. Fildena 25 and grapefruit juice both postpone its effects. Men should use this medication sparingly because an overdose can have major negative effects that need to be treated.