Zhewitra 40 active component is Vardenafil. Most patients with erectile dysfunction (ED) who use Vardenafil are male. For men with ED, maintaining an erection strong enough for sexual activity might be difficult. Vardenafil, the active ingredient in Zhewitra 40, belongs to the pharmacological class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors. PDE5 inhibitors, such as Vardenafil, help a man with ED achieve and maintain an erection when he is sexually aroused by boosting blood flow to the penis. Vardenafil is prescribed at a dosage of Zhewitra 40; a healthcare professional should determine the appropriate dosage for each individual.