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The main active ingredient in Filitra 10 mg is vardenafil, which belongs to a class of medications known as phosphodiesterase type-5 (PDE-5) inhibitors. Vardenafil works by relaxing the smooth muscles in the blood vessels and improving blood circulation, particularly in the penile region. When a man is sexually aroused, this increased blood flow helps produce a firm and long-lasting erection. However, the medication does not work without sexual stimulation and does not increase sexual desire.