Vasoconstrictor AgentsCocaineNorbornanesVasoconstrictionPhenylephrineAngiotensin IINorepinephrineVascular ResistanceMuscle, Smooth, VascularBlood PressureCocaine-Related DisordersDopamine Uptake InhibitorsCrack CocaineSelf AdministrationEndothelinsEndothelin-1Dose-Response Relationship, DrugRats, Sprague-DawleyConditioning, OperantMesenteric ArteriesRegional Blood FlowNucleus AccumbensSympathetic Nervous SystemVasomotor SystemReceptors, Endothelin15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidVasodilationReinforcement (Psychology)TyramineVasodilator AgentsBehavior, AddictiveMethoxamineForearmDrug-Seeking BehaviorReceptor, Endothelin ARenal CirculationReinforcement ScheduleBehavior, AnimalNitric OxideThromboxane A2Receptor, Endothelin BRats, WistarArteriesArteriolesHemodynamicsSerotoninExtinction, PsychologicalEndothelium, VascularPotassium ChlorideNG-Nitroarginine Methyl EsterProstaglandin Endoperoxides, SyntheticUrotensinsMotor ActivityAdrenergic alpha-AgonistsDopamine Plasma Membrane Transport ProteinsDopamineDogsPerfusionIndomethacinAdrenergic alpha-AntagonistsNitroprussideDrug InteractionsHeroinReceptors, ThromboxaneTime FactorsHeart RateNarcoticsSplanchnic CirculationBenztropineAcetylcholineSubstance Withdrawal SyndromeRewardMuscle TonusNordefrinNitric Oxide SynthaseMicrodialysisHydroxyeicosatetraenoic AcidsProstaglandinsAnalysis of VarianceViper VenomsPeptides, CyclicRenal ArterySumatriptanPhentolaminePulmonary CirculationSubstance Abuse DetectionSkin TemperatureEnzyme InhibitorsAdrenergic FibersButyrylcholinesteraseReceptor, Serotonin, 5-HT1BArginine VasopressinStreet DrugsAdrenergic alpha-1 Receptor AgonistsBretylium CompoundsLaser-Doppler FlowmetryDopamine AntagonistsSubstance-Related DisordersElectric StimulationKidney