Zhewitra is a brand name for a medication that contains Vardenafil as its active ingredient. Vardenafil is a phosphodiesterase type 5 (PDE5) inhibitor used to treat erectile dysfunction (ED) in men. Similar to other PDE5 inhibitors, such as Sildenafil (Viagra) and Tadalafil (Cialis), Vardenafil works by increasing blood flow to the penis during sexual stimulation. This helps men with ED to achieve and maintain an erection.