Most methods of determining the response of ambulatory patients to mercurial and other diuretics entail certain difficulties, even measuring the volume of urine or determining the amount of NaCl excreted may be inconvenient.G. determines the weight of the patient before and 2 days after intramuscular injection of meralluride (I).The loss of weight (body water) in response to different doses indicates the amount that should be given.If it is desired to use diuretics other than I, the amounts required can be estimated from a table in which such compounds are listed in terms of diuretic potency in terms of I.With I assumed to have a potency of 100%, the intramuscular efficiencies of other diuretics decrease in the order: mercurophylline 98, mercaptomerin 88, merethoxylline 82, salyrgantheophylline 75, and mercumatilin 76%.In congestive heart failure, I potentiates the action of NH4Cl in causing water elimination.Though not commonly used by injection, chlormerodrin (II) when injected showed a potency of 250% in comparison with I.When given orally, relative diuretic efficiency increased in the order: I 81, aminometradine (III) 254, II 284, and aminoisometradine (IV) 351.II is the least irritating mercurial diuretic.III and IV are nonmercurial diuretics of high efficiency.