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That means the practical answer to how long is bac water good for after opening is usually up to 28 days, provided the original expiration date has not arrived earlier and the vial still meets visual and handling checks
The 50 mg vial is reconstituted with 2 mL of bacteriostatic water, yielding a 25 mg/mL concentration (0.25 mg per unit on a 1 mL insulin syringe)
PMID 18843658
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