Lisinopril dihydrate is primarily used as an antihypertensive agent, effectively managing high blood pressure by relaxing blood vessels. It is also prescribed for heart failure, improving survival rates and reducing symptoms like shortness of breath and fatigue. Additionally, it is used post-heart attack to prevent further cardiac damage and improve recovery. In diabetic patients, it helps protect kidney function by reducing proteinuria and slowing the progression of kidney disease. Its long-acting nature allows for once-daily dosing, enhancing patient compliance. Always consult a healthcare professional for proper usage and dosage.