A device intended to be placed between a nebulizer or a metered dose inhaler (MDI) and the patient's mouth, to function as a reservoir into which an aerosol medication is dispensed in order to minimize delivery of large aerosolized particles. It is typically made of plastic materials and in the form of a small tube-like container. By holding the drug(s) after aerosolization (e.g., via an internal valve) this device reduces the direct delivery of large aerosolized particles which would otherwise deposit in the mouth/upper airway, but are intended for the lower airway. This is a reusable device.