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How long does bacteriostatic water last once it is used? Hospira recommends that once a vial of Bacteriostatic water is open the preservatives will prolong its life for up to 28 days. After 28 days the vial needs to be discarded. Other injectables without the bacteriostatic agent (single-dose vials) should be discarded after one single use.
Best Answer: So long as the vial has not been opened they will be good for a couple years past the expiration date. But the minute the vial is opened and the air gets in then they start to deteriorate. Some vials are labeled as good for 30 days, and some for 45, and still others for 90 days after opening. Read the accompanying info to see how long yours are good for after opening the vials. Source(s): Nana Lamb Â· 7 years ago.