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The Inventory of Drug Use Consequences (InDUC) is a self-administered measure of consequences of drug use. Psychometric characteristics have been published for its alcohol-focused parent instrument (Drinker Inventory of Consequences; W. Miller, J. Tonigan, & R. Longabough, 1995). Two studies provided information about the test-retest reliability (lifetime) of InDUC scales (Study 1, N = 34) and the replicability of findings to the 5 InDUC scales (recent; Study 2, N = 208). Four scales had good to excellent test-retest reliability. Findings also indicate that reductions in drug use and problems after treatment are large and that the magnitude of change differs between drug use and consequences. Consequences of drug use should be measured directly rather than be inferred from measures of use.