The Clinical Pharmacology and Toxicology (CPT) Pearls of the Week are short educational summaries of specific CPT topics. They are developed by physician members of the AHS Section of Clinical Pharmacology and Toxicology and are not meant to be detailed management guidelines or comprehensive reviews. The Pearls are located within the various categories on this page. These categories represent the breadth and depth of the specialty of CPT as well as the major core competencies of CPT training in Canada.