Trichlormethiazide (Standard) is the standard substance of Trichlormethiazide, and it is applicable for quantitative analysis, quality control, and related research in biochemical experiments. Trichlormethiazide (Naqua) is a short-acting, 3-dichloromethyl derivative of hydrochlorothiazide, belonging to the class of thiazide diuretics. Trichlormethiazide appears to block the active reabsorption of chloride and possibly sodium in the ascending loop of Henle, altering electrolyte transfer in the proximal tubule.