FRANKFURT, July 11 (Reuters) - Levitra, an impotence treatment from Bayer (BAYG.DE: Quote, Profile, Research) worked for up to 10 hours in a study of 383 patients, the German drugs and chemicals group said on Monday.Bayer said in a statement that Levitra, which competes with Viagra from Pfizer (PFE.N: Quote, Profile, Research) and Cialis from Eli Lilly (LLY.N: Quote, Profile, Research) and ICOS Corp (ICOS.O: Quote, Profile, Research), allowed patients to have sex between six and 10 hours after taking the drug.
