BenztropineCocaineCocaine-Related DisordersDopamine Uptake InhibitorsCrack CocaineSelf AdministrationDopamine AntagonistsDose-Response Relationship, DrugRats, Sprague-DawleyConditioning, OperantHormone AntagonistsExcitatory Amino Acid AntagonistsNucleus AccumbensNarcotic AntagonistsBehavior, AnimalNeurokinin-1 Receptor AntagonistsReinforcement (Psychology)Histamine H2 AntagonistsBehavior, AddictiveInterleukin 1 Receptor Antagonist ProteinMuscarinic AntagonistsPiperidinesMotor ActivityReinforcement ScheduleDopamineDrug-Seeking BehaviorGABA AntagonistsHistamine H1 Antagonists