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Bacteriostatic Water for Injection is sterile, non-pyrogenic water that contains 0.9% benzyl alcohol (9mg/mL) added as a bacteriostatic preservative. This preparation of sterile water and benzyl alcohol (BnOH) allows repeated withdrawals to be made from a single 30mL plastic vial. Hospira, the world’s leading manufacturer and supplier of bacteriostatic and sterile water, advises that once a vial of bacteriostatic water is open, the preservatives will prolong its life for up to 28 days. After this period, the vial should be discarded.