Zhewitra 20 mg is a medication primarily used to treat erectile dysfunction. Its active ingredient is Vardenafil, a phosphodiesterase type 5 (PDE5) inhibitor. Vardenafil works by relaxing the blood vessels in the penis, enhancing blood flow and facilitating an erection in response to sexual stimulation. Zhewitra 20 mg is similar to other PDE5 inhibitors like Viagra (Sildenafil) and Cialis (Tadalafil), but it has its unique profile in terms of onset and duration of action.