A nurse is reinforcing discharge teaching with a client who has angina and a prescription for sublingual nitroglycerin tablets. Which of the following statements by the client indicates an understanding of the teaching?

Rationale: A. “I will wait 15 minutes before taking a second tablet.": Waiting 15 minutes delays relief and increases the risk of complications. The client should take a second tablet if chest pain is unrelieved after 5 minutes, up to three doses within 15 minutes, then seek emergency help if symptoms persist. B. "I should stop taking the medication if I get a headache.": Stopping the medication due to a headache overlooks the therapeutic benefit. Headaches are a common side effect caused by vasodilation and can be managed with mild analgesics while continuing the medication as prescribed. C. "I should expect pain relief in 1 to 3 minutes.": Sublingual nitroglycerin is rapidly absorbed through the oral mucosa, leading to relief typically within 1 to 3 minutes. This fast onset is essential for treating acute angina episodes effectively. D. "I will swallow the tablet for faster absorption.": Swallowing the tablet bypasses the sublingual route, delaying its effect due to first-pass metabolism in the liver. The tablet must be placed under the tongue to ensure rapid absorption and therapeutic effectiveness.