Zhewitra 40 mg is a medication used to treat erectile dysfunction (ED) in men. It contains the active ingredient vardenafil, which is a phosphodiesterase type 5 (PDE5) inhibitor. Zhewitra 40 mg works similarly to other PDE5 inhibitors like sildenafil (Viagra) and tadalafil (Cialis), by increasing blood flow to the penis, allowing for improved blood circulation and the ability to achieve and maintain an erection during sexual stimulation.