1. Patient is pregnant; breast-feeding; unwilling to use birth control during the study; has secondary hypertension; severe renal dysfunction; hepatic insufficiency; stroke within the last six months; myocardial infarction, cardiac surgery, percutaneous transluminal coronary angioplasty, unstable angina or coronary artery bypass graft within the past three months; unstable or uncontrolled diabetes for the past three months defined as a glucosylates hemoglobin (HbA1c) greater than ten percent ; history of angioedema or hypersensitivity related to either study drug.