EphedrineEphedraPhenylpropanolamineAnesthesia, ObstetricalAnesthesia, SpinalPseudoephedrineEphedra sinicaHypotensionSympathomimeticsMetaraminolCesarean SectionRitodrineDoping in SportsPhenylephrineGene DosageVasoconstrictor AgentsDosage Compensation, GeneticCentral Nervous System StimulantsAnesthesia, Epidural