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Relationship between medication adherence and treatment outcomes: the COMBINE study
Allen Zweben1, Helen M Pettinati, Roger D Weiss
1Columbia University School of Social Work, New York, New York, USA. az173@columbia.edu
Medication adherence and combined behavioral intervention (CBI) impact alcoholism treatment outcomes. CBI protected placebo non-adherers, but offered little benefit to naltrexone non-adherers, suggesting medication exposure is key.
Area of Science:
- Addiction Medicine
- Clinical Psychology
- Psychopharmacology
Background:
- Medication adherence is linked to better drinking outcomes in alcoholism treatment.
- The interplay between medication, behavioral treatments, and drinking outcomes requires further investigation.
- This study examines how medication adherence and treatment type influence alcoholism recovery.
Purpose of the Study:
- To investigate the differential impact of medication adherence and treatment factors on drinking outcomes.
- To explore the interrelationships between medication adherence, combination treatments (naltrexone, acamprosate, medical management, combined behavioral intervention), and drinking outcomes using COMBINE Study data.
Main Methods:
- 1226 patients were randomized into 8 treatment combinations.
- Medication adherence was calculated as the proportion of pills taken.
- Generalized linear mixed models and proportional hazards models analyzed effects on percent days abstinent and time to first heavy drinking day.
Main Results:
- A significant interaction was found between medication adherence, combined behavioral intervention (CBI), and naltrexone.
- In the medical management (MM) only plus placebo group, adherers had significantly higher recovery rates (40%) than non-adherers (10%).
- CBI did not improve recovery rates for naltrexone-treated patients, and its benefit for placebo non-adherers was not significant when CBI was introduced.
Conclusions:
- Combined behavioral intervention (CBI) may protect individuals not adhering to placebo medication.
- CBI provided minimal additional benefit to individuals not adhering to naltrexone.
- For naltrexone non-adherers, relapse appears more related to insufficient medication exposure than CBI's influence.
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