Why should the Wockhardt UK Ltd micafungin sodium 50 mg powder for concentrate for solution for infusion product be used immediately after reconstitution and dilution?

The Wockhardt UK Ltd micafungin sodium 50 mg product contains no preservatives, requiring immediate use after reconstitution and dilution on microbiological grounds; otherwise, storage is the user's responsibility, normally no longer than 24 hours at 2–8°C unless reconstitution and dilution occurred under controlled, validated aseptic conditions.