What is the first step in the appropriate technique for using MDIs?

The first step in the appropriate technique for using metered-dose inhalers (MDIs) is to shake the inhaler. This is crucial because shaking helps to ensure that the medication is properly mixed with the propellant inside the canister. Many MDIs contain a liquid medication that can separate from the propellant over time, so shaking ensures that the correct dose of medication is delivered when the inhaler is activated.

Shaking the inhaler also helps to prevent blockage of the valve, which can occur if the inhaler is not adequately mixed. Proper technique is essential for ensuring that patients receive the full benefits of their medication, as improper inhalation technique can lead to inadequate delivery of the drug to the lungs.

Following the shaking step, the user can then proceed with the inhalation process, which often includes pressing down on the inhaler while inhaling slowly and deeply. However, it is the initial shaking that sets the stage for effective use of the inhaler.