For the study, the researchers evaluated the prevalence of erectile dysfunction and its relationship with coronary atherosclerosis in men with documented coronary artery disease. They hypothesized that erectile dysfunction prevalence corresponds to the severity of heart disease. Men who took the drugs were 4.8 times more likely to have an adverse reaction than men who took a placebo. The most common side effects among men who took the drugs were headache, flushing, and upper respiratory tract complaints and flu-like symptoms. There were no deaths. HealthDay Reporter Published Online, June 7, 2005. www.theannals.com, DOI 10.1345/aph.1E487 "Most of us think that one of the measurements one must do when you have a patient with newly diagnosed [erectile dysfunction] is look at testosterone levels," says Glenn Cunningham, MD, spokesman for the Endocrine Society and a professor at Baylor College of Medicine in Houston. If you need viagra canadian pharmacy viagra