Bipolar affective disorder is a medical illness with substantial morbidity and mortality. Further fueling the severity of this illness is the substantial co-occurrence with substance abuse that together poses an enormous public health problem.

This study will evaluate the efficacy of divaproex sodium (DVPX) vs. olanzapine (ZYP) vs. for alcohol relapse prevention and secondary mood stabilization. Bipolar patients who are actively drinking will be randomized to either Depakote ER ® (flexible dose schedule up to 2500 mg) or Zyprexa® (flexible dose schedule up to 20 mg).

Adjunctive benzodiazepine will be utilized for the treatment of alcohol withdrawal and as an adjunct anxiolytic during the early titration of DVPX and ZYP. Patients who, after 2 weeks, have stabilized will continue in the prophylaxis study which will last up to 46 weeks. Flexible dose scheduling and adjunctive antidepressant treatment as clinically indicated will be done to maximize tolerability, treatment compliance, and mood stability.

The primary outcome measure will be alcohol abuse relapse which will be defined, a priori, as 5 drinks in a 24 hour period. Patients who have a relapse as such defined will be terminated from the study. Secondary alcohol outcome measures (i.e. number of drinking days, % drinking days per month, standard drinks per drinking occasion, craving) will be assessed through the time-line follow-back method. Secondary outcome measures of mood stabilization (major mood relapse and adjunctive medication) will be assessed by prospective life charting.