EphedrineEphedraPhenylpropanolamineSubstance PAnesthesia, ObstetricalAnesthesia, SpinalPseudoephedrineEphedra sinicaHypotensionSympathomimeticsMetaraminolCesarean SectionDoping in SportsRitodrineSubstance-Related DisordersPhenylephrineVasoconstrictor AgentsCentral Nervous System StimulantsDrug and Narcotic ControlAnesthesia, Epidural