How long can the Leo Laboratories Limited heparin sodium 1,000 IU/ml injection product be stored after first opening, and at what temperature?

The Leo Laboratories Limited product, heparin sodium 1,000 IU/ml injection, may be stored after opening for a maximum of 28 days at 30°C, with chemical, physical and microbiological stability supported for this period; other in-use storage times and conditions are the user's responsibility.