The client who has emphysema and recently experienced a stroke receives a prescription for a metered-dose inhaler with a spacer device. The client asks the nurse if using the spacer is necessary. Which information should the nurse provide?

A. It prevents mouth infections when an inhaler is used: While spacers can reduce oral side effects like thrush with steroid inhalers, preventing mouth infections is not the primary reason for using a spacer with bronchodilators. B. It allows the medication to slowly enter the lungs: A spacer doesn't slow down medication entry; it holds the medication briefly, allowing the client more time to inhale effectively, but the primary goal is improving delivery efficiency. C. It increases the effectiveness of the medication: Using a spacer improves medication delivery by reducing the amount deposited in the mouth and throat and maximizing the dose that reaches the lungs, making treatment more effective. D. It allows time to inhale the entire dispensed dose: Although a spacer gives a few extra seconds to inhale the medication, the main advantage is optimizing deposition in the lungs rather than just allowing more time.