Methacholine ChlorideBronchoconstrictor AgentsDrug StorageMethacholine CompoundsDrug StabilityChloridesBronchial Provocation TestsBronchial HyperreactivityBronchoconstrictionChloride ChannelsAsthmaForced Expiratory VolumeAirway ResistanceBronchiVinyl ChlorideRespiratory HypersensitivityAdministration, InhalationSodium ChlorideParasympathomimetics