NaltrexoneNarcotic AntagonistsBehavior, AnimalAlcoholismReceptors, Opioid, muOpioid-Related DisordersNarcoticsMorphineReceptors, OpioidTaurineMethadyl AcetateSubstance Withdrawal SyndromeHeroin DependenceAlcohol AbstinenceBehavioral SymptomsNalbuphineTemperanceDisulfiramBehavior, AddictiveEthanolNalorphineNaloxoneBuprenorphineDelayed-Action PreparationsMotor ActivityAnalgesics, OpioidBehavior TherapyBehavioral SciencesDose-Response Relationship, DrugBehavioral MedicineHydromorphoneConditioning, OperantEndorphinsHeroinRats, Sprague-DawleyReceptors, Opioid, deltaBehaviorAlcohol DrinkingOpioid PeptidesReceptors, Opioid, kappaGenetics, BehavioralBehavioral ResearchBrainAnalysis of VarianceMorphine DependenceDouble-Blind MethodSheltered WorkshopsEuphoriaTime FactorsCognitive TherapySelf AdministrationCocaineExploratory BehaviorEnkephalin, Ala(2)-MePhe(4)-Gly(5)-MethadoneGeorgia (Republic)Central Nervous System DepressantsDrug InteractionsMacaca mulattaReinforcement (Psychology)PruritusContractsTreatment OutcomeRewardDrug ToleranceRats, Long-EvansOpiate Substitution TreatmentMaze LearningDisease Models, AnimalCocaine-Related DisordersButorphanolbeta-Endorphin