Megalis 10 mg is a prescription medicine that contains tadalafil, a phosphodiesterase type-5 (PDE5) inhibitor commonly used to treat erectile dysfunction (ED) in adult men. Erectile dysfunction is the inability to achieve or maintain an erection adequate for satisfactory physical activity. Tadalafil works by helping relax the smooth muscles and blood vessels in the penis. During physical stimulation, this allows increased blood flow into the penile tissue, making it easier to achieve and maintain an erection. Megalis does not normally cause an erection without physical stimulation and does not increase physical desire directly.
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