DigoxinLungLung DiseasesInhalation ExposureRespiratory Function TestsParticle SizeAdministration, InhalationBronchoalveolar Lavage FluidDigitoxinCardenolidesCardiotonic AgentsCardiac GlycosidesMedigoxinEleutherococcusNeriumDigitalis GlycosidesAnti-Arrhythmia AgentsDrug InteractionsOuabainRadioimmunoassayP-Glycoprotein