A nurse is preparing to administer a metered dose inhaler (MDI) medication to a client. Which of the following actions should the nurse take?

The correct answer is C: Shake the MDI prior to administration. This action is important to ensure proper dispersion of the medication within the device, which helps to deliver the correct dose to the client's lungs. By shaking the MDI before administration, the nurse helps prevent inconsistent dosing and ensures the client receives the intended therapeutic effect. Asking the client to inhale quickly for 1 second (choice A) may not allow enough time for the medication to be properly delivered. Asking the client to hold their breath for 2 seconds (choice B) is a common instruction after using an MDI, but shaking the device is crucial prior to administration. Washing the MDI canister in warm water after each use (choice D) is unnecessary and may damage the device.