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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.
My pharmacist advised that the bottle was good for up to 60 days after opening as long as its kept cool. I find no drop off of effectiveness going to 60 days. I believe it is a waste to through it out after 28 days because I still have over 80% of the bottle left after 28/30 days. As stated, and from what I was told. all insulin should be descarded after 30 days of first use.