DizzinessPrazosinVertigoAdrenergic alpha-AntagonistsAdrenergic alpha-1 Receptor AntagonistsVestibular DiseasesReceptors, Adrenergic, alphaVestibular Function TestsVestibular NeuronitisReceptors, Adrenergic, alpha-1YohimbineAdrenergic alpha-AgonistsClonidineDioxanesMeniere DiseaseNorepinephrineScorpion StingsHeadacheNystagmus, PathologicWhiplash InjuriesPhenylephrineAdrenergic alpha-1 Receptor AgonistsAdrenergic AntagonistsReceptors, AdrenergicPostural BalanceNystagmus, PhysiologicAdrenergic alpha-2 Receptor AntagonistsSensation DisordersSyncopePhentolamineIntense Pulsed Light TherapyLabyrinth DiseasesHypotension, OrthostaticReality TherapyDoxazosinDiagnostic Techniques, OtologicalDose-Response Relationship, DrugMethoxamineOxymetazolinePhenoxybenzamineReceptors, Adrenergic, alpha-2PropranololAporphinesLabyrinthine FluidsTreatment OutcomeMotion SicknessDouble-Blind MethodOtorhinolaryngologic DiseasesBlood PressureCaloric TestsMuscle ContractionTime FactorsVasoconstrictionNauseaRadioligand AssayAdrenergic alpha-2 Receptor AgonistsAccidental FallsVestibule, Labyrinth