RAAS (Renin-Angiotensin-Aldosterone System) antagonists are a group of medications that play a vital role in regulating blood pressure. They work by blocking or interfering with the actions of the RAAS, ultimately leading to blood vessel relaxation and a decrease in blood pressure. These medications are commonly prescribed to manage hypertension, heart failure, and kidney diseases. Besides their primary use in blood pressure control, RAAS antagonists have shown promise in treating various other conditions, including diabetic nephropathy and cardiovascular diseases.