Narcotic 03 : A drug (as opium) that in moderate doses dulls the senses, relieves pain, and induces profound sleep, but in excessive doses causes stupor, coma, or convulsions
National Institute for Occupational Safety and Health (NIOSH), Centers for Disease Control and Prevention (CDC), The Emergency Response Safety and Health Database, Atlanta, GA, USA 2014. http://www.cdc.gov/NIOSH/ershdb/glossary.html#B, (Emr Resp Sfty and Hlth Database - Amer) {794}