An infusion preparation which is to be used in dialyzing a dialysis patient for ameliorating the anemic state by improving nutritional conditions, thus reducing the dosing amount of erythropoietin, controlling the serum phosphorus level to thereby regulate the serum phosphorus level within a definite range and inhibiting the protein catabolism and which contains at least essential amino acids, characterized in that the amino acids are composed of at least L-isoleucine, L-leucine, L-lysine, L-methionine, L-phenylalanine, L-threonine, L-tryptophan, L-valine, L-alanine, L-arginine, L-aspartic acid, L-glutamic acid, L-histidine, L-proline, L-serine, L-tyrosine, glycine and L-cysteine and the ratio of essential amino acids : non-essential amino acids is 2.5 or higher.