List of products in the National Drug Code with proprietary name . Enalapril is used to treat high blood pressure. Lowering high blood pressure helps prevent strokes, heart attacks, and kidney problems. It is also used to treat heart failure and to help prevent people with a certain heart problem (left ventricular dysfunction) from developing heart failure. Enalapril belongs to a class of drugs known as ACE inhibitors. It works by relaxing blood vessels so blood can flow more easily.