Multi-cartridge push mode droplet delivery device

A droplet delivery device for delivery of more than one fluid to the respiratory system of a user, the more than one fluid delivered as one or more ejected stream of droplets, the droplet delivery device comprising:

• a housing comprising a mouthpiece located at an airflow exit of the housing;
• multiple fluid reservoirs disposed within or in fluid communication with the housing comprising a first fluid reservoir and a second fluid reservoir;
• at least one piezoelectric vibrating member operably coupled to a plurality of ejector plates, wherein each plate has a plurality of openings and at least one membrane between the vibrating member and the plurality of ejector plates;
• and
• a modulator configured to avoid continuously ejecting a first fluid of the more than one fluid from the multiple fluid reservoirs for the entirety of the inhalation and ejecting the first fluid in pulses.