Zhewitra 20 mg is a medication that contains Vardenafil, which is used to treat erectile dysfunction (ED) in men. Vardenafil belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors, which work by increasing blood flow to the penis during sexual stimulation, leading to an erection. Vardenafil is also available in generic form under various names. The generic versions should be as effective as the brand-name drug but are often more affordable.