Metered Dose Inhalers, or MDIs, shoot
medication through a nozzle to form a spray that comes out through the mouthpiece. MDIs deliver a high concentration of medicine directly to the lungs very quickly. There are 2 types of propellant-containing MDI devices: press-and-breathe and breath-actuated. This video demonstrates the proper use of the press-and-breathe inhaler using a closed-mouth technique.