Diuretic
Inhibiting the kidney’s ability to reabsorb sodium, thus enhancing the loss of sodium in the urine. And when sodium is lost in the urine, water goes with it. (This type of diuretic is called a high-ceiling diuretic or a loop diuretic).
Enhancing the excretion of both sodium and chloride in the urine so that water is excreted with them. This is how the thiazide diuretics work.
Blocking the exchange of sodium for potassium, resulting in excretion of sodium and potassium but relatively little loss of potassium. These diuretics are therefore termed potassium sparing diuretics.