TORONTO -- Every year, thousands of Canadians will experience adverse reactions to medication meant to save their life and make them better, but instead makes them significantly worse. Advocates say it is a leading cause of death in Canada and are pushing for new rules around monitoring side effects, tracking the reactions, and implementing solutions that would minimize these potentially life-threatening reactions. Mike Sawatsky had a pre-existing kidney condition, but was an otherwise healthy father, husband, and avid outdoorsman. In 2013, he received an approved monoclonal antibody therapy, rituximab, to treat his kidney disease. But instead of getting better, his body had a reaction to the drug so severe it damaged his short term memory function, leaving him permanently disabled.