Zestril Tab 20mg is a prescription medication containing the active ingredient lisinopril, an angiotensin-converting enzyme (ACE) inhibitor. It is primarily used to treat high blood pressure (hypertension), and heart failure, and to improve survival after a heart attack. These tablets work by relaxing blood vessels, allowing blood to flow more easily, which helps to lower blood pressure and reduce the workload on the heart. These medications are to be used under a doctor’s supervision, as they are used to treat a serious condition. Trust these medications to provide you with instant relief.