NCIt definition : The potassium salt form of fenquizone, a quinazolinone structurally related to metolazone,
and sulphonamide-based diuretic with diuretic activity. As a thiazide-like diuretic,
fenquizone acts by blocking reabsorption of sodium in the proximal tubule and the
ascending branch of the loop of Henle. This causes an increase in diuresis with the
elimination of chloride and sodium.;