Eleven lots of olanzapine distributed by Pharmascience Inc., Pro Doc Limitée and Laboratoire Riva Inc. are being voluntarily recalled. There is a possibility that bottles from the recalled lots may contain tablets of a different drug, ondansetron. Inadvertent ingestion of ondansetron may lead to adverse effects or drug interactions. Missing a dose of olanzapine may lead to reduced control of symptoms. Bottles of the affected lots should not be used and should be returned as outlined in the Recall Notice issued by Pharmascience Inc., Pro Doc Limitée and Laboratoire Riva Inc. Please review Health Canada's Advisory website to see a full list of lot numbers.