NaltrexoneNarcotic AntagonistsSubstance Withdrawal SyndromeAlcoholismReceptors, Opioid, muOpioid-Related DisordersMorphineNaloxoneMorphine DependenceReceptors, OpioidNarcoticsAlcohol Withdrawal DeliriumEthanolAlcohol Withdrawal SeizuresTaurineMethadyl AcetateHeroin DependenceTemperanceAlcohol AbstinenceNalorphineBehavior, AddictiveDelayed-Action PreparationsDisulfiramNalbuphineAnalgesics, OpioidBuprenorphineHeroinDose-Response Relationship, DrugHydromorphoneEndorphinsDouble-Blind MethodReceptors, Opioid, kappaReceptors, Opioid, deltaCentral Nervous System DepressantsOpioid PeptidesDrug ToleranceRats, Sprague-DawleyMethadoneBehavior, AnimalAlcohol DrinkingConditioning, OperantSheltered WorkshopsEnkephalin, Ala(2)-MePhe(4)-Gly(5)-Time FactorsDrug ImplantsOpiate Substitution TreatmentWithholding TreatmentDrug InteractionsEuphoriaContractsTreatment OutcomeGeorgia (Republic)EnkephalinsPruritusbeta-EndorphinMorphinansNicotineCocainePain Measurement