3. Using cocaine at least 8 days in a consecutive 30 day period over the 60 day period immediately preceding study entry (If subject was receiving inpatient substance abuse treatment within 30 days prior to screening, subject must have been using cocaine at least 8 days in a consecutive 30 day period over the 60 day period immediately preceding admission to inpatient treatment); 4.)Having a negative urine toxicology (BE) test during screening (no less than 5 days prior to randomization) and a negative urine toxicology (BE) test on the day of randomization. Repeat testing allowed until required negative BE results are obtained;