This article provides a high-level overview of the anatomical therapeutic chemical/defined daily dose (ATC/DDD) toolkit developed by the World Health Organization (WHO) for drug utilization studies. This kit facilitates comparison of drugs at the national, international, and regional levels, monitoring of trends in drug product use, and assessment of drug safety. The article provides a description of the process to request ATC/DDD codes and the way the request is reviewed by the WHO International Working Group for Drug Statistics Methodology…
