- Prior Concomitant Medication: Treatment with enzyme altering agents (e.g. carbamazepine, phenytoin, cimetidine, sodium valporate) within 30 days of the craving provocation visit; Use of any prescription psychoactive medication (such as but not limited to antidepressants, antipsychotics, anxiolytics) within 14 days of the craving provocation visit; Participant has used an over-the-counter (OTC) medication such as antihistamines, sedating agents, or any compound that would have a sedating effect within 24 hours of the craving provocation visit; Current use of any nicotine replacement therapy.