Therapeutics and Clinical Risk Management, Always talk to your doctor about the risks and benefits of any treatment. Main article: PDE5 inhibitor Vardenafil’s indications and contraindications are the same as with other PDE5 inhibitors; it is closely related in function to sildenafil citrate Viagra and tadalafil Cialis. Can erectile dysfunction drug use lead to ischaemic optic neuropathy? What should I do if I missed a dose of Levitra Vardenafil? Tadalafil Tadalafil , or Cialis, is the longest-lasting ED drug on the market. Vardenafil is taken only when needed, about 60 minutes before sexual activity.Levitra Prices, Coupons and Patient Assistance Programs. Levitra is a member of the impotence agents drug class and is commonly used for Erectile Dysfunction. The cost for . Vardenafil — also known as Levitra® — is an FDA-approved medication that is used to treat erectile dysfunction. Along with Viagra®, Cialis® and Stendra®, vardenafil is one of the most popular ED drugs on the market today to help you get your mojo back.. Let’s explore everything there is to know about vardenafil, including how it . • LEVITRA is taken as needed: For most patients, the starting dose is 10 mg, up to once daily. Increase to 20 mg or decrease to 5 mg based on efficacy/tolerability. () • A starting dose of 5 mg LEVITRA should be considered in patients ≥65 years of age. () • LEVITRA is taken orally, approximately 60 minutes before sexual activity.