Lisinopril is an oral medication used to treat high blood pressure and heart failure. Learn about side effects, warnings, dosage, and more. Lisinopril is an ACE inhibitor used to treat high blood pressure and heart conditions. Learn about its uses, side effects, and precautions. Lisinopril is a prescription generic medication used to treat high blood pressure (hypertension). Learn about side effects, drug interactions, dosages, warnings, and more. Learn about common and rare lisinopril side effects and what to do if they occur. 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] 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 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. 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. 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. 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.