Lisinopril is an ACE inhibitor. It is used to treat high blood pressure, congestive heart failure in adults, or to improve survival after a heart attack. Learn about common and rare lisinopril side effects and what to do if they occur. LISINOPRIL (lyse IN oh pril) treats high blood pressure and heart failure. It may also be used to prevent further damage after a heart attack. It works by relaxing blood vessels, which decreases the amount of work the heart has to do. It belongs to a group of medications called ACE inhibitors. Advertisement. Lisinopril is a medication belonging to the drug class of angiotensin-converting enzyme (ACE) inhibitors and is used to treat hypertension (high blood pressure), heart failure, and heart attacks. [7] Detailed Lisinopril dosage information for adults, the elderly and children. Includes dosages for Hypertension, Congestive Heart Failure, Myocardial Infarction and more; plus renal, liver and dialysis adjustments. Lisinopril is an oral medication used to treat high blood pressure and heart failure. Learn about side effects, warnings, dosage, and more. Lisinopril is used alone or together with other medicines to treat high blood pressure (hypertension). High blood pressure adds to the workload of the heart and arteries. It is used in combination with other medications to treat heart failure. Lisinopril is also used to improve survival after a heart attack. Lisinopril is in a class of medications called angiotensin-converting enzyme (ACE) inhibitors. Find patient medical information for Lisinopril (Prinivil, Zestril, and Others) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Lisinopril is an ACE inhibitor used to treat high blood pressure and heart conditions. Learn about its uses, side effects, and precautions.