Pressurised Metered Dose Inhalers (pMDIs)

Also known as pump inhalers, these are the most commonly used inhaler devices. They are propellent-based and deliver a specific, amount of medication to the lungs, in the form of aerosol spray; which needs to be inhaled. It releases reproducible doses every time on actuation. This means that the same amount of dose is released every time. These inhalers do not depend upon the patient’s inhalation to trigger the release of the drug. They require co-ordination between the actuation of the canister and inhalation of the dose. To put it simply, you must inhale at the exact moment when the canister is pressed and the dose is released. pMDIs also come with a dose counter, making it easy to keep a track of the number of puffs remaining in the device.