Rogue pharmacies are not licensed to sell in the United States and put you at risk of counterfeit or tainted drugs How Many Online Pharmacies Are There? Using our ED service, you can get erectile dysfunction pills online safely and have them delivered to your door in just a couple of days. First and foremost, be sure that whichever online pharmacy you choose is legitimate, safe, and secure. The difference between the vardenafil molecule and sildenafil citrate is a nitrogen atom’s position and the change of sildenafil’s piperazine ring methyl group to an ethyl group. However, some states require a live video consultation. Be sure the one you choose works in your state. Call your doctor or seek emergency medical attention if your erection is painful or lasts longer than 4 hours.Vardenafil 4 tablets Blister 20 mg. Vardenafil, sold under the brand name Levitra among others, is a medication that is used for treating erectile dysfunction. [1] [2] It is a PDE5 inhibitor. [1] It is taken by mouth. Patent expiration dates: July 23, Patent use: TREATMENT OF ERECTILE DYSFUNCTION BY ADMINISTERING A FILM-COATED TABLET. Medicaments containing vardenafil hydrochloride trihydrate. Patent 8,, Issued: September 23, Inventor (s): Serno Peter & Grunenberg Alfons & Ohm Andreas & Bellinghausen . Levitra is not a cure for ED and you still need to be aroused for the medication to work. Levitra and its generic version (vardenafil) are available in doses of: milligrams. 5 milligrams.