Online pharmacies also may not fill short-term prescriptions, such as those for antibiotics. Most erectile dysfunction medications belong to the drug class known as PDE5 inhibitors , which help relax the muscles and increase blood flow to allow for a full erection. Interactions What drugs and food should I avoid while taking Levitra Vardenafil? This is not a complete list of side effects and others may occur. In some cases, ED can cause a strain on relationships and impact self-esteem. Side Effects What are the side effects of Levitra Vardenafil?tadalafil (Cialis) vardenafil (Levitra, Staxyn) Caution: Do not use these ED medications if you take nitrates, such as nitroglycerin or a similar medicine, for chest pain. The combination can. Drugs & Supplements Levitra (Vardenafil) Generic Name: Vardenafil Reviewed: March 21, Vardenafil is used in adult men to treat erectile dysfunction (impotence). Vardenafil may also be used. 5 milligrams 10 milligrams 20 milligrams The best dose depends on your: age health medications Dosages Levitra is available as an oral tablet in several strengths. Your doctor will decide the.