Fildena 200 is a medication used to treat erectile dysfunction (ED) in men. It contains a high dose of sildenafil citrate, the same active ingredient found in Viagra. Sildenafil works by increasing blood flow to the penis, helping achieve and maintain an erection. The 200 mg dose is quite high, and it’s usually prescribed only if lower doses are ineffective. It’s important to follow your doctor's guidance on dosage.Common side effects can include headaches, flushing, indigestion, nasal congestion, and dizziness. More serious side effects could include sudden vision loss, hearing loss, or priapism (a prolonged and painful erection). If you experience severe side effects, seek medical attention immediately.