A patient who has stable angina pectoris and a history of pr…

A patient who has stable angina pectoris and a history of previous myocardial infarction takes nitroglycerin and amlodipine (Norvasc). The patient asks the primary care nurse practitioner (NP) why it is necessary to take amlodipine. The NP should tell the patient that amlodipine (Norvasc):