Use of Methadone Take-Home Contingencies with Persistent Opiate and Cocaine Abusers

Abstract

This study investigated conditions under which methadone patients with urinalysis evidence of persistent multiple drug abuse would respond to take-home incentive procedures. Study subjects submitted > or = 80% opiate and/or cocaine positive urines during a 5-week baseline period (M, W, F urine testing) while maintained on 60 mg methadone. Doses were raised to 80-100 mg methadone under blind conditions and subjects were randomly assigned to receive methadone take-home doses under one of three conditions: (a) earn a 1-day take-home privilege for each opiate and cocaine-free test delivered (daily contingent condition), (b) three negative test results required for the first take-home privilege, with each subsequent negative test earning one take-home dose; a positive test reset the contingency back to three again (weekly contingent condition), or (c) a control group that did not receive take-home privileges (no take-home control). Five of 21 subjects (24%) assigned to a contingent take-home intervention (2 from condition a, 3 from condition b) showed marked reductions in drug use and delivered 4 or more consecutive weeks of drug-free urines during a 16-week intervention. No subject in the control group met these criteria. Percent positive urines decreased by 14% and 18% from baseline in daily and weekly contingency groups, respectively, compared to a decline of 2% in the no take-home control group (planned contrast of means p < .07 and .05, respectively). Thus, the study demonstrated that take-home incentives can be effective for reducing during-treatment use of opiates and cocaine in methadone patients with a poor prognosis related to their persistent multiple drug use.