How many puffs are equivalent to 1 metered dose inhalation?

A metered dose inhalation (MDI) is designed to deliver a specific dose of medication with each actuation, typically referred to as a "puff." Each puff corresponds to one actuation of the inhaler, which releases a precise amount of medication into the lungs. This mechanism ensures that the patient receives the intended dose needed for effective treatment. Therefore, one metered dose inhalation is equivalent to one puff, making this answer the correct choice. Understanding the proper usage of inhalers is crucial for achieving optimal therapeutic outcomes in respiratory conditions.