Final answer:
A nurse should inform that a spacer with a fluticasone inhaler reduces the risk of oral thrush, an adverse effect caused by medication lingering in the mouth and throat.
Step-by-step explanation:
The nurse should include that the spacer decreases the risk for oral thrush, which is one of the adverse effects of inhaled corticosteroids like fluticasone. Using a spacer with an inhaler helps to deliver medication more effectively to the lungs and reduces the amount of medication that stays in the mouth and throat, which can lead to oral thrush. Oral thrush is a fungal infection caused by Candida that is characterized by white patches in the mouth or on the tongue.