MDIs use a propellant to deliver a measured dose of drugs to the lungs during each breath though some patients have difficulty synchronizing the puff with the inhalation.

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Metered Dose Inhalers (MDIs) use a propellant to deliver medication directly to the lungs, but coordinating the actuation of the device with inhalation can be challenging for some patients, affecting the efficiency of drug delivery.

MDIs Use a Propellant to Deliver a Measured Dose of Drugs