Problem to be solved: to provide a method for long-term and stable storage of P1, p4-bis (5 - YL) tetrafluorophosphate crystals. The packaged P1, p4-bis (5. Beta. - ylyl) tetrafluorophosphate crystal, which is characterized by selecting one of the conditions under conditions (1) to (3) and storing it in such conditions, or its pharmacological Available salt storage method.(1) the storage temperature is below 0 \u00b0 C. to 25 \u00b0 C., and (2) the storage temperature is less than 25 \u00b0 C. or above 40 \u00b0 C., and the crystal pH is 4.5 to 8.0, and (3) the storage temperature is less than 40 \u00b0 C. or above 60 \u00b0 C., and the crystal pH is 5.0 to 6.4. Diagram【課題】容易かつ安定的に、P1,P4-ビス(5’-ウリジル)テトラホスフェート結晶を長期保管するための方法を提供する。【解決手段】下記(1)~(3)の保管条件のうち、いずれか1つの条件を選択し、当該条件にて保管することを特徴とする、包装されたP1,P4-ビス(5’-ウリジル)テトラホスフェート結晶又はその薬学的に許容可能な塩の保管方法。(1)保管温度0℃以上25℃未満、(2)保管温度25℃以上40℃未満であり、結晶pH4.5~8.0、(3)保管温度40℃以上60℃未満であり、結晶pH5.0~6.4。【選択図】図1
