A client is being discharged with a new prescription for propranolol [Inderal LA]. Which of the following must be included in discharge instructions?

A. Propranolol does not typically elevate potassium levels, and salt supplements are not contraindicated. B. Yellow or blurred vision is not commonly associated with propranolol use but with digoxin toxicity. C. Abrupt discontinuation of propranolol can lead to rebound hypertension, tachycardia, or exacerbation of angina, so it should be tapered off under medical supervision. D. Grapefruit juice does not significantly interact with propranolol.