A nurse is providing discharge teaching to a client has a new prescription for a metered dose inhaler (MDI). Which of the following instructions should the nurse include in the teaching?

A. Shaking the inhaler for 3 to 5 seconds ensures the medication is properly mixed for an accurate dose. B. For most medications delivered by MDI, waiting a few seconds between inhalations is sufficient, not 2 minutes. C. Pressing down twice on the MDI canister is incorrect. The correct technique involves pressing the canister once while inhaling deeply. D. Rinsing the mouth with mouthwash after inhaling the medication is not necessary. However, it is important to rinse the mouth with water, especially after using corticosteroid inhalers, to prevent oral thrush.