A nurse is teaching a client who has a new prescription for nitroglycerin sublingual tablets for treating angina. Which of the following instructions should the nurse include in the teaching?

“Call 911 if pain persists 30 minutes after taking one tablet.”

“Take a tablet every 10 minutes until the pain subsides.”

“Place the tablet under the tongue until dissolved.”

“Store the tablets in a refrigerator in a plastic container.”