APP PharmaceuticalsAPP Pharmaceuticals, Inc. announced that it has received approval from the U.S. Food and Drug Administration (FDA) to market Chlorothiazide Sodium for Injection, USP. Chlorothiazide Sodium for Injection, USP is therapeutically equivalent to the reference-listed drug DiurilĀ®, which is marketed by Lundbeck Pharmaceuticals. Chlorothiazide is a diuretic used to treat high blood pressure, and fluid retention in people with congestive heart failure, cirrhosis of the liver and kidney disorders.