Enalapril, which was patented in 1978, is a medication used to treat hypertension, symptomatic heart failure, and asymptomatic left ventricular dysfunction. Plus, it has been proven to protect the function of the kidneys in hypertension, heart failure, and diabetes, and may be used in the absence of hypertension for its kidney protective effects. Additionally, Enalapril is widely used in chronic kidney failure, not to mention that it is an emerging treatment for psychogenic polydipsia. Basically, this medication works by blocking a substance in the body that causes the blood vessels to tighten, thereby relaxing them. This, of course, lowers blood pressure and increases the supply of blood and oxygen to the heart. As for its side effects, Enalapril can cause headache, tiredness, feeling lightheaded with standing, and cough. Besides, this medication has other side effects that are more serious, including angioedema and low blood pressure. Bear in mind that the use of Enalapril during pregnancy is believed to result in harm to the baby. Make sure you take this medicine regularly either on an empty stomach or with a light meal. Plus, do not take Enalapril more often than directed, and do not stop taking it except on the advice of your doctor or health care professional.