A nurse is reinforcing teaching with a client who has a new prescription for sustained-release verapamil. Which of the following statements by the client indicates an understanding of the teaching?

"I will crush the tablet to make it easier to swallow."

"I will increase my daily intake of fiber and fluid."

"I will follow up with monthly laboratory tests to check for anemia."

"I will sit upright for 30 minutes after taking the medication."