Provided is a composition for maintaining a function of platelets, having as an active ingredient a pyridone derivative represented by the following general formula (I), or a salt thereof (in the formula, ring A, R
1
, R
2
, R
3
, and R
4
represent the definitions given in the description).
提供一种用于维持血小板功能的组合物,其活性成分为以下一般式(I)所代表的
吡啶酮衍
生物,或其盐(在公式中,环A,R1,R2,R3和R4代表描述中给出的定义)。