Laboratoire Riva Inc. is recalling two lots (C9718 and C9719) of Riva Senna 8.6 mg tablets (NPN 80079605) due to microbial contamination. The product is a laxative typically used to ease constipation. The recalled lots were sold in Quebec and Ontario. Ingesting the contaminated product may result in symptoms including abdominal discomfort or pain, diarrhea, nausea and vomiting. Children, pregnant women, the elderly and people with a weakened immune system may be more susceptible to adverse effects from microbial contamination. Health Canada will monitor the company’s recall and inform Canadians if new safety information becomes available on this issue.