This publication presents estimates of drug-related emergency department (ED) episodes from the Drug Abuse Warning Network (DAWN) from 1994 through the first half of 2001. DAWN is an ongoing, national data system that collects information on drug-related visits to EDs from a national probability sample of hospitals. This publication marks a major change in the presentation of DAWN findings from ED data. The new title introduces a new design with major changes in format and content. These changes were designed to provide more detailed information, information about a larger number of drugs (both illicit and licit), more consistent information, and more information pertaining to the 21 metropolitan areas oversampled in DAWN. This publication has dual purposes: first, to release preliminary estimates for the first half of 2001, and second, to present revised full-year trends from 1994 to 2000 using the new format for the first time. This publication contains the following estimates of drug-related ED episodes and specific drug mentions: preliminary estimates for January-June 2001, with revised half-year estimates from July 1996 through December 2000 for comparison; and final, revised estimates for the full years 1994 through 2000. (Contains 306 tables.) (GCP)