Other breath-activated inhalers are also called dry powder inhalers. These inhalers do derece contain the pressurised inactive gas to propel the medicine. You don't have to push the canister to release a dose. Before you start using the preparation, read the manufacturer's printed information leaflet from inside the pack. It https://vuf.minagricultura.gov.co/Lists/Informacin%20Servicios%20Web/DispForm.aspx?ID=9595541