Analgesics, OpioidReceptors, Opioid, muReceptors, OpioidReceptors, Opioid, deltaDelayed-Action PreparationsOctreotideReceptors, Opioid, kappaSterilization, ReproductiveOpioid PeptidesAlbuterolNadololBronchodilator AgentsEthanolaminesParaneoplastic Endocrine SyndromesLong-Acting Thyroid StimulatorAdrenergic beta-AgonistsContraceptive Agents, FemaleNarcotic AntagonistsOxprenololAdministration, InhalationAdrenergic beta-2 Receptor AgonistsNaloxoneOpioid-Related DisordersAnti-Asthmatic AgentsNaltrexoneSomatostatinDouble-Blind MethodPeak Expiratory Flow RateAsthmaPropranololRisperidoneEnkephalinsPropanolaminesInsulin, Long-ActingEnkephalin, Ala(2)-MePhe(4)-Gly(5)-MorphineAdrenergic beta-AntagonistsNarcoticsAndrostadienesDrug Therapy, CombinationDose-Response Relationship, DrugEnkephalin, D-Penicillamine (2,5)-Forced Expiratory VolumeEndorphinsDynorphinsBuprenorphineTime FactorsEnkephalin, LeucineEnkephalin, Leucine-2-AlanineDrug Administration SchedulePainClinical Trials as TopicDiprenorphinebeta-EndorphinAnalgesicsBenzeneacetamidesTreatment OutcomeDrug ToleranceHeart RateFentanylMorphinansPain MeasurementMethadoneHydromorphoneBenzomorphansAnalgesiaPyrrolidinesSubstance Withdrawal SyndromeOpiate Substitution TreatmentHeroinRats, Sprague-DawleyChronic PainPrescription Drug MisuseLevorphanolMolecular Sequence DataMorphine Dependence