Pharmaceutical compositions which contain isoleucine, leucine, valine, and alanine as active ingredients, are useful for treating liver diseases such as hepatitis, liver cirrhosis, liver cancer, and the like via maintenance and improvement of albumin level in blood. In preferred embodiments, the mass ratio of isoleucine:leucine:valine is 1:1.9 to 2.2:1.1 to 1.3; the mass ratio of the total mass of isoleucine, leucine and valine: alanine is 1:0.05 to 10; and a daily dose per person contains isoleucine in an amount of 0.2-30.0 g, leucine in an amount of 0.2-30.0 g, valine in an amount of 0.2-30.0 g, and alanine in an amount of 0.2-50.0 g.