Abstract: The application describes apparatus and methods for delivering a powdered medicament for inhalation. The medicament is put in a receptacle (100) on a vibration generator (80) operated by fluid pressure, e.g. by means of an eccentric rotor. A flow of gas from a supply (20) is passed into the receptacle (100), producing in concert with the vibration an aerosol which passes out of the receptacle and along a tube (110) to be inhaled by the patient. Both the gas flow supply and vibration may be subject to the operation of a control unit (60), which may time the production of the aerosol according to a patient's breathing cycle, e.g. as part of a ventilator system.