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Fildena is a medication containing sildenafil citrate, a phosphodiesterase type-5 (PDE-5) inhibitor used to treat erectile dysfunction (ED) in men. Sildenafil works by enhancing the effects of nitric oxide, a natural chemical released during sexual stimulation. This causes relaxation of smooth muscles in the penis, leading to increased blood flow and an erection sufficient for sexual activity. Common side effects include headache, flushing, dizziness, indigestion, nasal congestion, and visual disturbances. Rare but serious side effects include prolonged erections (priapism), sudden vision or hearing loss, and cardiovascular complications.