Enalapril is an angiotensin-converting enzyme inhibitor, ACE, which treats hypertension. It also treats congestive heart failure. Enalapril is available in brand form as Vasotec or Epaned and belongs to the drug class Angiotensin-converting enzyme inhibitors. It can be taken alone or with other diuretics or antihypertensive. Enalapril acts by relaxing the blood vessels that, as a result, lowers the blood pressure.