AlkaloidsNarcoticsMorphineAnalgesics, OpioidErgot AlkaloidsIndole AlkaloidsPyrrolizidine AlkaloidsVinca AlkaloidsCinchona AlkaloidsOpiate AlkaloidsBerberine AlkaloidsAmaryllidaceae AlkaloidsOpioid-Related DisordersReceptors, OpioidNaloxoneAconitumAporphinesClavicepsOpiumCatharanthusCodeineBenzylisoquinolinesHeroinDelphiniumNarcotic AntagonistsMorphine DerivativesEnkephalinsEndorphinsEtorphineMethadoneSolanaceous AlkaloidsBerberinePlant ExtractsHeroin DependenceReceptors, Opioid, muNeotyphodiumSubstance Abuse DetectionPapaverCoptisRutaceaePlant PoisoningSubstance Withdrawal SyndromeDihydromorphineEnkephalin, Leucine-2-AlanineMolecular StructureCyclazocineErgotismLycopodiumErgotamineMorphine DependenceBuprenorphineNaltrexoneLysergic AcidRubiaceaeEnkephalin, LeucineEnkephalin, MethionineEthylketocyclazocineStereoisomerismEphedraBelladonna AlkaloidsMorphinansHarmineAspidospermaPapaveraceaeGas Chromatography-Mass SpectrometryPlants, MedicinalPlant BarkDiprenorphineEphedrineErgolinesAnnonaceaeSenecioHeterocyclic Compounds with 4 or More RingsIbogaineUncariaRauwolfiaVeratrum AlkaloidsPoriferaMethadyl AcetateHypocrealesNoscapineAconitineEpichloeLiliaceaeMitragynaHarmalineBenzomorphansEnkephalin, Ala(2)-MePhe(4)-Gly(5)-BenzophenanthridinesCorydalisCyclizationEphedra sinicaReceptors, Opioid, deltaAmphibian VenomsApocynaceaeOxymorphoneIndolizidinesIsoquinolinesDrug ToleranceVinblastine