Vardenafil and sildenafil belong to the same class of drugs called PDE5 inhibitors so they are used for the same condition – erectile dysfunction. However, when it comes to vardenafil vs sildenafil, there are few differences between the two drugs.Website: https://www.medexpressrx.com/health-wellness/vardenafil-uses-price-dosage-side-effects-interactions.aspx