Impotence drug Levitra proved effective in men with diabetes who had not been helped by Viagra, according to results from a clinical trial, Levitra’s makers said. Doctors estimate that half of all diabetic men will eventually develop erectile dysfunction. The results -- presented by researchers on Monday at the American Diabetes Association Scientific Session in Orlando, Florida -- could provide a boost for Levitra makers GlaxoSmithKline Plc and Bayer AG . The two companies paid for the trial and issued a press release announcing the results.
