Lisinopril is a drug of the angiotensin-converting enzyme (ACE) inhibitor class used primarily in treatment of hypertension, congestive heart failure, and heart attacks, and also in preventing renal and retinal complications of diabetes. Its indications, contraindications and side effects are as those for all ACE inhibitors. A number of properties distinguish it from other ACE inhibitors: It is hydrophilic, has a long half-life and tissue penetration, and is not metabolized by the liver. Animal and human data have revealed evidence of embryolethality and teratogenicity associated with angiotensin-converting enzyme (ACE) inhibitors. There are no controlled data in human pregnancy. Congenital malformations have been reported with the use of ACE inhibitors during the first trimester of pregnancy, while fetal and neonatal toxicity, death, and congenital anomalies have been reported with their use during the second and third trimesters of pregnancy.