ProcaineCocainePenicillin G ProcaineCocaine-Related DisordersDopamine Uptake InhibitorsCrack CocaineSelf AdministrationAnesthetics, LocalTetracaineConditioning, OperantDibucaineNucleus AccumbensDose-Response Relationship, DrugCaffeineReinforcement (Psychology)ProcainamideBehavior, AddictiveLidocaineDrug-Seeking Behavior4-Aminobenzoic AcidReinforcement ScheduleBehavior, AnimalRats, Sprague-DawleyExtinction, PsychologicalBenzocaineMotor ActivityDopamine Plasma Membrane Transport ProteinsDopamineTetrachlorvinphosHeroinPenicillin G BenzathineNarcoticsBenztropineFluorocarbon PolymersSubstance Withdrawal SyndromeRewardHypothalamus, PosteriorCalcium RadioisotopesVeratrumParaldehyde