Medications ideally improve patient health, occasionally with mild or moderate side effects. But sometimes patients have significant damaging responses to drugs, events called adverse drug reactions (ADRs). In Canada, there are 87,000 – 200,000 debilitating or life-threatening ADRs, which cause 3,600 – 10,000 deaths each year. The problem is worse in children, where ADRs are three times more life threatening than in adults.