non potassium sparing diureticsthiazide diuretics potassium sparingaction of potassium sparing diureticsaldactone potassium sparing diureticmechanism of loop diureticsfurosemide loop diureticdefine loop diureticsloop and thiazide diureticsloop diuretics actionadverse effects of loop diureticshigh ceiling loop diureticssparing diuretics