Which of the following statements indicates that an adolescent understands how to use a metered-dose inhaler (MDI) correctly?

The statement "I need to shake the inhaler well before I use it" demonstrates a proper understanding of how to prepare a metered-dose inhaler (MDI) for effective use. Shaking the inhaler before use is crucial because it ensures that the medication is mixed evenly and that the correct dose is delivered when the inhaler is activated. This preparation step is essential for the inhaler's effectiveness, as the components can settle and separate when the inhaler is idle.

Effective use of an MDI involves several steps, including proper shaking, correct inhalation technique, and timing the release of medication with inhalation. Those who understand the correct preparation of the inhaler, such as shaking it, are more likely to achieve optimal medication delivery and management of their respiratory condition.