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Megalis 20 mg is a medication that contains the active ingredient Tadalafil. It is primarily used to treat erectile dysfunction (ED), a condition where a man has difficulty achieving or maintaining an erection sufficient for sexual activity. Tadalafil is a phosphodiesterase type 5 (PDE5) inhibitor, similar to other medications used for the same purpose, such as Viagra (Sildenafil) and Levitra (Vardenafil).