Which of the following is a recommended step when using a metered dose inhaler?

Using a metered dose inhaler (MDI) effectively is crucial for optimal medication delivery, and inhaling deeply is indeed an important step. When using an MDI, deep inhalation helps ensure that the medication reaches the lungs effectively, allowing for proper absorption. As the patient inhales, it's important to press down on the inhaler to release a dose of medication at the beginning of the breath. This technique maximizes the movement of the aerosolized medication into the airways, where it can exert its therapeutic effects.

Each recommended practice when using an inhaler significantly contributes to the overall efficacy of the medication. Shaking the inhaler, using a spacer, and priming the inhaler are also important steps to ensure proper dosing and drug delivery, but they serve different purposes in the process of inhaler use. For instance, shaking distributes the medication evenly and priming prepares the inhaler for correct dosing. Using a spacer can enhance drug delivery and prevent less medication from getting stuck in the mouth and throat. However, the act of inhaling deeply is particularly critical during the actual act of inhalation to ensure the medication reaches the lungs effectively.