<qa>  What is the name of the drug that has been tested in the past?The treatment of substance abuse and dependence disorders is complex and involves individual and group therapy, maintenance of sobriety, commitment to structured living, and participation in self-help groups. To date, pharmacotherapy for substance dependence disorders has had limited success. Several medications have been tested in the past, including tricyclic antidepressants, selective serotonin reuptake inhibitors, buspirone, bupropion, venlafaxine, nefazodone, bromocriptine, amantadine, naltrexone, and acamprosate. Of these, naltrexone has obtained an FDA indication for treatment of alcohol dependence, and acamprosate is in use in Europe. However, these medications are effective in only a relatively small proportion of patients. Benzodiazepines may be useful in treatment of withdrawal syndromes, but their potential for abuse and dependence limits their use in maintenance treatment. 