What is zestril?

Zestril is a brand name for the medication lisinopril, which is an angiotensin-converting enzyme (ACE) inhibitor. It is primarily used to treat high blood pressure (hypertension) and heart failure, as well as to improve survival after heart attacks. By relaxing blood vessels, Zestril helps to lower blood pressure and reduce the workload on the heart. Common side effects may include cough, dizziness, and elevated potassium levels.