Prize Contingency Management for Cocaine-Dependent Methadone Patients

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

280 participants

Study Classification

INTERVENTIONAL

Study Start Date

2011-11-30

Study Completion Date

2018-05-31

Brief Summary

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The investigators will randomize 300 cocaine-dependent methadone patients to 1 of 6 conditions: (a) a control group, (b) a contingency management condition that arranges a 100% probability of winning a prize with each draw and has 3 prize categories, (c) a contingency management condition that arranges a 31% probability of winning and has 3 prize categories, (d) a contingency management condition that arranges a 100% probability of winning and has 7 prize categories, (e) a contingency management condition that arranges a 31% probability of winning and has 7 prize categories, or (f) usual prize contingency management with a 50% probability of winning from 3 prize categories. Magnitudes of reinforcement will be identical across conditions, but lower overall probability conditions arrange for greater chances of winning larger magnitude prizes. The investigators expect that the new contingency management conditions will reduce cocaine use relative to the control condition, that 31% probability conditions will decrease drug use relative to 100% conditions, and that 7-prize category conditions will reduce drug use compared to 3-prize category conditions. In addition, the 31%/7-category condition is expected to be most efficacious. Results will be instrumental for further developing prize contingency management to improve outcomes of cocaine-dependent methadone patients.

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Conditions

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Cocaine Abuse

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Study Groups

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Treatment Group A

Standard Care

Intervention Type BEHAVIORAL

Participants earn the chance to win prizes for the targeted behavior, cocaine abstinence.

Interventions

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prize contingency management

Participants earn the chance to win prizes for the targeted behavior, cocaine abstinence.

Intervention Type BEHAVIORAL

Eligibility Criteria

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Inclusion Criteria

* age \> 18 years
* current DSM-IV diagnosis of cocaine dependence
* enrolled at the clinic for \>3 months
* on a stable dose of methadone (no changes) for \>1 month and not requesting a dose alteration
* submitted \>1 clinic cocaine positive sample in the last 6 months
* English speaking
* pass a quiz related to understanding the informed consent form