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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.
As a general rule, most bottles of insulin are good for 28 days once they're opened. Of course, how quickly a person goes through a vial is highly individual. Some may go through a bottle in a week or two. Others, on a lower dosage, may not use all the insulin within four weeks. But the drug's stability and potency is only guaranteed for 28 days. Opened insulin pens typically last 14 days, though some last only 10 days. If you're uncertain, check with your mother's pharmacist to find out how long her insulin should last.