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.