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Zhewitra 20 Mg is a medication that contains vardenafil, a phosphodiesterase type 5 (PDE5) inhibitor. It is primarily used to treat erectile dysfunction (ED), a condition characterized by the inability to achieve or maintain an erection sufficient for satisfactory sexual performance. Vardenafil works by inhibiting the action of the PDE5 enzyme, which is responsible for the degradation of cyclic guanosine monophosphate (cGMP) in the smooth muscle cells of the penis. By blocking PDE5, vardenafil increases the levels of cGMP, leading to relaxation of the smooth muscles and increased blood flow to the penis, which results in an erection.