| abstract |
An object of the present invention is to provide a β-type crystal and / or a γ-type crystal of a quinolinone derivative represented by the chemical formula (I), which is useful as a drug, particularly an antiallergic agent. It is an object of the present invention to provide a quinolinone derivative preparation excellent in bioabsorbability and stability as a component, and a method for producing the same. The chemical formula (I) contains an antioxidant and / or a lubricant. A quinolinone derivative preparation comprising, as an active ingredient, a β-form crystal and / or a γ-form crystal of a quinolinone derivative represented by the formula: and a method for producing the same. |