A nurse is reinforcing teaching with a client who has a prescription for ferrous sulfate elixir. Which of the following statements by the client indicates an understanding of the teaching?

A. “I can prevent constipation if I drink more milk while taking this medication.": Milk can actually decrease the absorption of iron and does not prevent constipation. Adequate hydration and dietary fiber are more effective strategies for managing iron-related constipation. B. “I will mix the medication with a full glass of water.”: Ferrous sulfate elixir should be diluted in water or juice to improve taste, reduce gastrointestinal irritation, and enhance absorption. This statement reflects proper understanding of safe and effective administration. C. “I will report black stools to my doctor": Black stools are a common, harmless side effect of iron supplementation and do not usually require reporting. Misunderstanding this can cause unnecessary concern if the client is aware that it is expected. D. “I can prevent nausea if I take the medication on an empty stomach.”: Taking iron on an empty stomach may actually increase gastrointestinal irritation and nausea. It is often recommended to take iron with food if intolerance occurs, though absorption may be slightly reduced.