Enalapril is an angiotensin conversion enzyme (ACE) inhibitor used to treat cardiovascular problems in poultry. It is often given in combination with diuretics.
Fathi, M., M. Haydari, and T. Tanha Effects of enalapril on growth performance, ascites mortality, antioxidant status and blood parameters in broiler chickens under cold-induced ascites. Poultry science journal 3.2 (2015)