Fildena 25 is designed to treat erectile dysfunction (ED) by improving blood flow to the penis. The 25mg dose is a lower strength, typically prescribed for those who may be sensitive to Sildenafil or who have mild ED. It works within 30-60 minutes and can last for 4-6 hours, providing the necessary support for sexual activity. A prolonged, painful erection lasting more than 4 hours, which requires immediate medical attention to prevent permanent damage. Its effects usually last for 4 to 6 hours, giving enough time for sexual activity.