A system for providing breathing gas and nebulized medication to a patient, the system comprising: a pressurized source of breathing gas adapted to provide a flow of breathing gas; an adaptor for introducing a nebulized medication into the breathing gas, the adaptor comprising: a reservoir adapted to contain a volume of medication; a vibrating mesh disposed at a reservoir outlet of the reservoir and adapted to receive a flow of the medication from the reservoir and output a flow of nebulized medication; and a mixing chamber having: a gas inlet coupled to the pressurized source of breathing gas and adapted to receive the flow of breathing gas from the pressurized source; a nebulizer inlet adapted to receive the flow of nebulized medication from the vibrating mesh, the vibrating mesh being disposed between the nebulizer inlet and the reservoir outlet; an internal volume in fluid communication with the gas inlet and the nebulizer inlet (3 16) and adapted to allow for mixing of the flow of breathing gas and the flow of nebulized medication to produce a flow of mixed gas; and a mixed gas outlet in fluid communication with the internal volume and adapted to output the flow of mixed gas; and characterised by: a pressure tap tube in fluid communication with the pressurized source and the reservoir, such that a gas in the pressure tap tube bypasses the mixing chamber to pressurize a headspace in the reservoir above the volume of medication. a pressurized source of breathing gas adapted to provide a flow of breathing gas; an adaptor for introducing a nebulized medication into the breathing gas, the adaptor comprising: a reservoir adapted to contain a volume of medication; a vibrating mesh disposed at a reservoir outlet of the reservoir and adapted to receive a flow of the medication from the reservoir and a reservoir adapted to contain a volume of medication; a vibrating mesh disposed at a reservoir outlet of the reservoir and adapted to receive a flow of the medication from the reservoir and output a flow of nebulized medication; and a mixing chamber having: a gas inlet coupled to the pressurized source of breathing gas and adapted to receive the flow of breathing gas from the pressurized source; a nebulizer inlet adapted to receive the flow of nebulized medication from the vibrating mesh, the vibrating mesh being disposed between the nebulizer inlet and the reservoir outlet; an internal volume in fluid communication with the gas inlet and the nebulizer inlet (3 16) and adapted to allow for mixing of the flow of breathing gas and the flow of nebulized medication to produce a flow of mixed gas; and a mixed gas outlet in fluid communication with the internal volume and adapted to output the flow of mixed gas; and characterised by: a gas inlet coupled to the pressurized source of breathing gas and adapted to receive the flow of breathing gas from the pressurized source; a nebulizer inlet adapted to receive the flow of nebulized medication from the vibrating mesh, the vibrating mesh being disposed between the nebulizer inlet and the reservoir outlet; an internal volume in fluid communication with the gas inlet and the nebulizer inlet (3 16) and adapted to allow for mixing of the flow of breathing gas and the flow of nebulized medication to produce a flow of mixed gas; and a mixed gas outlet in fluid communication with the internal volume and adapted to output the flow of mixed gas; and characterised by: a pressure tap tube in fluid communication with the pressurized source and the reservoir, such that a gas in the pressure tap tube bypasses the mixing chamber to pressurize a headspace in the reservoir above the volume of medication.