Final answer:
The nurse should include information that the client must notify their provider if the pulse rate is less than 50 bpm due to propranolol medication.
Step-by-step explanation:
The nurse should include the information that if the client's pulse rate is less than 50 bpm, they should notify their provider. Propranolol is a beta-blocker medication that works by blocking the beta-1 receptors, which slows down the heart rate. It is important for the client to be aware of their pulse rate and notify their healthcare provider if it falls below 50 bpm as it may be a sign of bradycardia. The other options, such as doubling the next dose if a dose is missed, discontinuing the medication for lightheadedness, or the medication causing heat intolerance, are not accurate information and should not be taught to the client.