Study of the Effect of Magnetic Stimulation Repetitive Transcranial on Impulsivity in Cocaine Dependence

Inclusion criteria: 1. Diagnosis of the cocaine dependence syndrome, alone or in combination with abuse of alcohol and nicotine dependence (DSM IV, 1994; SCID-P, 1994). 2. 20 days or less withdrawal 3. 18-35 years old. 4. If female, to be using contraception (barrier, oral contraceptive, IUD, surgical sterilization). 5. Fixed residential address in Sao Paulo Exclusion criteria: 1. Other Mental Disorders (DSM IV, 1994; SCID-P, 1994). 2. organic brain disease, neurosurgery to implant metal clip or epilepsy. 3. severe uncontrolled clinical comorbidity. 4. use current or within last six months of psychotropic drugs in general, except for Clonazepam dose of up to four mg / day. 5. Changes clinically significant laboratory findings. 13 6. Condition or situation to which in the opinion of the investigator put the patient at risk significant, which may confound the results, or interfere substantially in individual's participation in the study. 7. Mandate that mandating the judicial treatment for cocaine dependence