Levitra Information from Bayer Pharmaceuticals Corporation
Information regarding Levitra from the manufacturer’s official website
Levitra Information from the FDA
Information on Levitra from the Center for Drug Evaluation and Research of the US Food and Drug Administration
MedlinePlus Drug Informaton: Vardenafil (marketed as Levitra)
Information about Levitra from the US National Library of Medicine and the National Institute of Health
Erectile Dysfunction
Information about erectile dysfunction or ED from the National Institute of Diabetes and Digestive and Kidney Diseases or NIDDK and the National Institute of Health