Zestril is a brand name for the medication lisinopril. Lisinopril is an ACE inhibitor medication used to treat high blood pressure (hypertension), heart failure, and to improve survival after a heart attack. Synonyms for Zestril that may be found on medication labels or in medical literature include ACE inhibitors, blood pressure medications, heart failure medications, and lisinopril. Other brand names for lisinopril include Prinivil and Qbrelis. It is important to only take medications as prescribed by a healthcare provider and to never make changes to a medication regimen without consulting a physician.