InjectionsDopamine AgonistsInjections, IntravenousInjections, IntramuscularGABA AgonistsInjections, SubcutaneousInjections, IntralesionalInjections, Intra-ArticularDose-Response Relationship, DrugPurinergic P1 Receptor AgonistsRats, Sprague-DawleyInjections, IntraperitonealMuscarinic AgonistsNicotinic AgonistsInjections, IntraventricularAdrenergic AgonistsAdrenergic alpha-2 Receptor AgonistsSerotonin 5-HT2 Receptor AgonistsSerotonin 5-HT1 Receptor AgonistsHistamine AgonistsInjections, IntradermalPurinergic P2 Receptor AgonistsAdrenergic beta-AgonistsGABA-A Receptor AgonistsInjections, EpiduralTime FactorsRats, WistarCholinergic AgonistsInjections, Intra-ArterialAdrenergic alpha-AgonistsAdenosine A1 Receptor AgonistsExcitatory Amino Acid AgonistsIntravitreal InjectionsMice, Inbred C57BLInjections, SpinalAdrenergic alpha-1 Receptor AgonistsMicroinjectionsDisease Models, AnimalReceptors, Opioid, muInjections, JetCannabinoid Receptor AgonistsInjections, IntraocularReceptors, Opioid, kappaAdrenergic beta-3 Receptor AgonistsCells, CulturedAdenosine A3 Receptor AgonistsRadioligand AssayGABA-B Receptor AgonistsReceptors, Opioid, deltaLigandsCalciumReceptors, Dopamine D2Serotonin 5-HT4 Receptor AgonistsPiperidinesSerotonin AntagonistsAdenosineSignal TransductionCyclic AMPFlow Injection AnalysisBehavior, AnimalCarbacholIsoproterenolEnkephalin, Ala(2)-MePhe(4)-Gly(5)-NeuronsRats, Inbred StrainsReceptors, OpioidRabbitsGuinea PigsGonadotropin-Releasing HormoneClonidineCell LineCricetinaeNarcotic AntagonistsSperm Injections, IntracytoplasmicSerotoninDrug InteractionsPurinergic AgonistsKineticsPhenethylaminesSubstance Abuse, Intravenous2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepineRNA, MessengerMuscimolPyrrolidinesCalcium Channel AgonistsAdrenergic beta-1 Receptor AgonistsCannabinoidsCHO CellsBinding, CompetitiveParasympathomimeticsBenzazepinesBrainReceptors, Adrenergic, beta-2NaloxoneQuinpiroleMice, KnockoutReceptors, Adrenergic, betaNorepinephrineMice, Inbred BALB CReceptors, Purinergic P1