The article presents findings from examination of 15 patients with cirrhosis of the liver complicated by encephalopathy. A study was made into the blood content of aminoacids and ammonia, which levels were found to have been raised in cirrhotic patients. The use of dufalac and nutriklinz dispelled clinical manifestations of encephalopathy normalizing the content of ammonia and modifying the aminoacid dysbalance at the expense of lowering of the blood concentration of cerebrotoxic aminoacids.