Additional Study Information: This study will test a computer-based behavioral intervention to decrease cocaine use. Those who fail to achieve cocaine abstinence after the first 4 weeks while receiving the behavioral treatment will continue the behavioral treatment and be randomly assigned to one of two groups (one group will receive Adderall-XR (MAS-ER) and the other group will receive placebo (an inactive sugar pill)), over the course of 10 weeks. Patients will be asked to come into the clinic for outpatient treatment 3 times per week.