A nurse is educating a patient with a productive cough about taking an expectorant. The nurse explains the importance of drinking a full glass of water with the medication. Which statement by the patient indicates a need for further education on expectorant use?

A. "I will take the medication with a sip of water to make it easier to swallow.": Taking the expectorant with even a small amount of water aids swallowing, but a full glass is recommended for optimal effect. This shows partial understanding, but not a critical safety issue. B. "I will drink an extra cup of coffee to help the expectorant work better.": While caffeine does not enhance expectorant effectiveness, drinking coffee is not harmful in this context. The patient may need clarification, but it does not indicate a dangerous misunderstanding. C. "I will take my expectorant with an antitussive to help relieve my cough faster.": Expectorants work by loosening mucus, while antitussives suppress coughing. Taking both together can counteract the action of the expectorant, reducing effectiveness. This statement indicates a misunderstanding that requires further education. D. "I will increase my daily water intake to ensure the expectorant is effective.": Adequate hydration thins secretions and enhances expectorant effectiveness. This demonstrates correct understanding of how to maximize the medication’s therapeutic effect.