Highlights from this report include: for the period July, 1973, through March, 1974, there were 115,994 drug-abuse episodes reported at medical facilities involved in the Drug Abuse Warning Network (DAWN) Project that involved 159,411 drug mentions. Of the roughly 2,500 substances included in the 159,411 drug mentions, 10 substances accounted for 61 percent of the most frequently mentioned drugs, while 20 substances accounted for 83 percent of all drug mentions. Additional data are provided on drug use by race, age, sex, employment status, motivation, and frequency of use for all drugs and for eight individual drugs-heroin, marijuana, LSD, diazepam, speed, secobarbital, d-Propoxyphene, and flurazepam. This report presents data on drug-abuse episodes and drug mentions collected through DAWN for the period July, 1973, through March, 1974, the second phase of the DAWN project. Following the initial phase of the DAWN project, modifications were made to the collection sample. For this report, data were obtained from 1,304 hospital emergency rooms, hospital inpatient units, county medical examiners, student health centers, and crisis centers, located in 29 SMSAs (standard metropolitan statistical areas) and a collection of Other Cities. DAWN is a large-scale, ongoing drug abuse collection system with several objectives: identifying substances associated with drug abuse episodes; monitoring drug abuse patterns and trends; assessing health hazards associated with drug abuse; and providing data for national, State, and local drug abuse policy and program planning. Tables and figures