This website has been archived for historical purposes and is no longer being maintained or updated. This is the pre-2006 version of the Ambulatory Care Drug Database, which used NCHS classification systems along with FDA’s National Drug Code Directory for coding drug characteristics. It is only useful for looking up drug characteristics in NAMCS and NHAMCS for data years prior to 2006. For information about the current Ambulatory Care Drug Database, see the
New Ambulatory Care Drug Database System.