Zhewitra 20 mg is a medication used to treat erectile dysfunction (ED) in men. Its active ingredient is Vardenafil, a drug belonging to the class of PDE5 inhibitors. It works by improving blood flow to the penis, helping men achieve and maintain an erection during sexual activity. During sexual arousal, the body releases nitric oxide (NO) in the penile tissue. Nitric oxide activates cGMP (cyclic guanosine monophosphate), which relaxes smooth muscles in the blood vessels of the penis. This relaxation allows increased blood flow into the erectile tissue, producing an erection. Normally, the enzyme PDE5 breaks down cGMP, causing the erection to subside.
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