In this issue of Emergency Medicine Clinics, guest editors Drs. Christopher P. Holstege and Joshua D. King bring their considerable expertise to the topic of Toxicology Emergencies. The field of medical toxicology has grown dramatically over the past decade, with the emergence of new pharmaceuticals, abused substances, chemicals within the workplace, and agents of terrorism. In this issue, top experts in the field address some of the more common, controversial, or emerging areas in this challenging area.