A new spectroscopic method has been developed for the determination of the drug furosemide used to treat congestive heart failure and other conditions. The drug is alsosed illegally by some athletes as a stimulant and rapid weight-loss agent.Yali Liu, Huijuan Wang, Jian Wang and Yuanfang Li of Southwest University, in Chongqing, China, explain how furosemide 4-chloro-N-furfuryl-5-sulfamoyl-anthranillic acid, FUR is a potent diuretic. It is widely used in the treatment of chronic kidney failure, high blood pressure, congestive heart failure and cirrhosis of the liver. Its effects are correlated directly with administered dose as too are its side-effects. Testing for FUR.