Abstract: A continuous flow nebulizing device for patients receiving long term nebulized medicant respiratory therapy. The nebulizing device comprises a nebulizer vial through which nebulizing fluids are delivered from a large supply vessel to conventional nebulizing apparatus. Thereby, the nebulizing apparatus connected to the continuously replenished nebulizer vial, delivers a larger volume of nebulized medicants on a continuous basis to a patient than can be provided by a conventional nebulizer vial without removing the conventional nebulizer vial from the nebulizer. For critially ill patients, the nebulizing device is used as part of a nebulizer/ventilator circuit. For voluntary respiratory patients, the nebulizer device output is used without a ventilator. Medicant supplying circuits are provided whereby a single medicant is selectably delivered from a plurality of large supply vessels without disconnecting the nebulizing vial from the nebulizer.