Zhewitra 20 mg contains vardenafil, which is a medication used to treat erectile dysfunction (ED) in men. Vardenafil belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors, similar to sildenafil (Viagra) and tadalafil (Cialis). Vardenafil works by inhibiting the action of PDE5, an enzyme that regulates blood flow in the penis. By blocking PDE5, vardenafil helps to increase blood flow to the penis during sexual stimulation, resulting in improved erectile function. Zhewitra 20 mg contains 20 milligrams of vardenafil per tablet. The recommended starting dose for most men with ED is 10 mg taken orally approximately 30 minutes before anticipated sexual activity. Depending on individual response and tolerability, the dose may be adjusted by a healthcare provider to a maximum of 20 mg or decreased to 5 mg as needed.