Hydrochlorothiazide is a drug from thiazide diuretic class, which is the water pill. It helps your body from absorbing lots of salt that might results into fluid retention. It treats the fluid retention in people who are suffering from cirrhosis in liver, congestive heart failure or the edema caused due to the estrogen or steroid or the kidney disorders. This kind of medication is also quite helpful in treating the high blood pressure or the hypertension. There are many other purposes when the hydrochlorothiazide is being used.