Final answer:
The most appropriate instruction for a patient taking lisinopril after an MI is to continue taking the medication as prescribed.
Step-by-step explanation:
The most appropriate instruction for a patient being discharged after a myocardial infarction (MI) and taking lisinopril 10 mg daily would be to advise the patient to continue taking the medication as prescribed by the healthcare provider. Lisinopril is commonly prescribed after an MI to reduce the strain on the heart and prevent future complications. It is important for the patient to take the medication consistently and not discontinue it without consulting their healthcare provider.