We propose an integrated system of counseling services onsite in primary care obstetrical clinics, comparing a manualized brief advice (closely approximating "treatment as usual") to manualized motivationally enhanced cognitive behavioral therapy. Treatment providers are obstetrical nurses. Therapy patients are taught skill sets designed to enhance motivation to abstain from drugs of abuse, as well as designed to prevent relapse during the perinatal period. It is our hypothesis that therapy patients will be more successful at achieving stated study aims than those receiving brief advice.