The present invention aims to provide an amino acid-containing granule preparation improved in the ease of taking medication than conventional products, which disintegrates rapidly. The amino acid-containing granule preparation of the present invention containing granules having a maximum particle size of substantially not more than 1000 µm and a bulk density of not less than 0.57 g/mL markedly improves ease of taking medication without impairing disintegration property, as compared to conventional amino acid-containing granule preparations.本發明係提供一種改善先行技術品之服用感,且可快速崩解之含有胺基酸的顆粒製劑者為其目的。製劑中之顆粒最大粒徑實質上為1000μm以下,且容積密度為0.57g/mL以上之本發明之含有胺基酸之顆粒製劑,相較於先行技術之含有胺基酸之顆粒製劑,本發明在不損及崩解性下,明顯改善服用感。