An "O2 nebulizer" usually refers to a standard nebulizer, like the Resp-O2 brand, that turns liquid medicine into a fine mist for respiratory conditions (asthma, COPD), often powered by compressed air, not pure oxygen, though oxygen can be used with some systems like in oxygen cages or integrated into advanced circuits for patients already on oxygen therapy. It delivers medication directly to the lungs via a mask or mouthpiece, helping patients breathe easier when they can't use inhalers effectively.

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