A device for delivery of a composition to an airway of a subject, the device comprising, in fluid communication: a gas inlet ; a gas outlet ; an actuator having an upper surface and a lower surface; a composition receptacle adapted to receive the composition; and a dispersion chamber ; wherein the actuator is configurable between: (a) a first configuration wherein the lower surface of the actuator is seated adjacent the gas inlet to restrict gas flow entering the device and wherein the upper surface of the actuator is adjacent to a lower extent of the composition receptacle to allow the composition to be located in the composition receptacle ; and (b) a second configuration wherein the lower surface of the actuator is displaced in the direction of the gas outlet , compared with the first configuration, to open a gas flow path into the device through the gas inlet and wherein the upper surface of the actuator is adjacent to an upper extent of the composition receptacle to displace the composition into the dispersion chamber ; and wherein the actuator is configurable between the first configuration and the second configuration via each of: (i) application of positive pressure via the gas inlet ; and (ii) application of negative pressure via the gas outlet . a gas inlet ; a gas outlet ; an actuator having an upper surface and a lower surface; a composition receptacle adapted to receive the composition; and a dispersion chamber ; wherein the actuator is configurable between: (a) a first configuration wherein the lower surface of the actuator is seated adjacent the gas inlet to restrict gas flow entering the device and wherein the upper surface of the actuator is adjacent to a lower extent of the composition receptacle to allow the composition to be located in the composition receptacle ; and (b) a second configuration wherein the lower surface of the actuator is displaced in the direction of the gas outlet , compared with the first configuration, to open a gas flow path into the device through the gas inlet and wherein the upper surface of the actuator is adjacent to an upper extent of the composition receptacle to displace the composition into the dispersion chamber ; and (a) a first configuration wherein the lower surface of the actuator is seated adjacent the gas inlet to restrict gas flow entering the device and wherein the upper surface of the actuator is adjacent to a lower extent of the composition receptacle to allow the composition to be located in the composition receptacle ; and (b) a second configuration wherein the lower surface of the actuator is displaced in the direction of the gas outlet , compared with the first configuration, to open a gas flow path into the device through the gas inlet and wherein the upper surface of the actuator is adjacent to an upper extent of the composition receptacle to displace the composition into the dispersion chamber ; and wherein the actuator is configurable between the first configuration and the second configuration via each of: (i) application of positive pressure via the gas inlet ; and (ii) application of negative pressure via the gas outlet . (i) application of positive pressure via the gas inlet ; and (ii) application of negative pressure via the gas outlet . <EOS>