Fildena 100 is a medication that contains sildenafil citrate, commonly used to treat erectile dysfunction (ED). It works by increasing blood flow to the penis during sexual stimulation, helping to achieve and maintain an erection. It's important to take it as prescribed by a healthcare professional and to be aware of potential side effects, such as headaches, flushing, or digestive issues. Always consult with a doctor before starting any new medication, especially for ED.