The reason I'm asking the question is that there can be terrible consequences. This results in deaths, is very costly for the health care system because of the number of hospitalizations, and the figures are alarming. In the United States, they result in 106,000 deaths every year, and more than two million adverse drug reactions require a patient to be hospitalized. We can compare that to what is happening in Canada and Québec.
On February 28th, 2008. See this statement in context.