MSRA-0701

An 80-year-old man comes to the liver clinic for his regular check-up. He has been a patient of the clinic for a while due to his liver cirrhosis caused by alcohol abuse. During the examination, he appears cachexic and jaundiced. Upon closer inspection of his abdomen, it is distended, and the shifting dullness test indicates the presence of free fluid in the abdomen. A sample of the fluid is collected, which shows 17g/l of fluid protein. What medication would be the most appropriate to prescribe?