Uses of This Medicine. Amlodipine and benazepril is a combination of medicines that are used to treat high blood pressure (hypertension). High blood pressure adds to the workload of the heart and arteries.If it continues for a long time, the heart and arteries may not function properly.enazepril is an angiotensin-converting enzyme (ACE) inhibitor. It works by blocking a substance in the body that causes the blood vessels to tighten. This relaxes the blood vessels and lowers blood pressure.