This recall results from a report by a pharmacist where a tablet of ondansetron (8 mg yellow, round tablet, imprinted with "R" on one side and "154" on the other side) was found in a sealed bottle of olanzapine (5 mg white, biconvex, tablet printed "OZ5" with blue ink on one side and blank on the other side). Missing a dose of olanzapine may lead to a reduced control of symptoms. Inadvertent ingestion of ondansetron may lead to adverse effects, such as an allergic reaction. There is also the potential for drug interactions if ondansetron is inadvertently ingested, including interactions resulting in serotonin syndrome in patients taking other serotonergic drugs such as antidepressants and lithium.