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Bacteriostatic water (often called "bac water") is sterile water that contains 0.9% benzyl alcohol as a preservative.
Key Characteristics
• Preservative Action: The 0.9% benzyl alcohol inhibits the growth of bacteria rather than killing it outright.
• Multi-Use Vials: Unlike plain sterile water (which must be discarded after a single use), a multi-dose vial of bacteriostatic water can be accessed repeatedly over a 28-day period once punctured, provided aseptic technique is used.
• Common Use: It is widely used as a diluent or reconstitution vehicle for lyophilized compounds, peptides, or medications requiring an aqueous solution.
• Forum Consensus: Users on platforms like Reddit agree that bacteriostatic water differs primarily from plain sterile water because of this benzyl alcohol preservative, which prevents microbial contamination during multi-dose withdrawals.
Important Safety & Contraindications
• Neonates: Solutions containing benzyl alcohol must not be used in newborns or neonates due to the risk of severe toxicity (such as gasping syndrome).
• Not for Wound Irrigation: It is designed for reconstitution and specific routes of injection (intravenous, intramuscular, or subcutaneous), not for open wound irrigation.
• Intravenous Warning: Administering unmixed bacteriostatic water directly or without a solute via IV can cause hemolysis (the destruction of red blood cells).
• Quality & Testing: Sourcing from verified, lab-tested, and USP-grade suppliers is essential, as contaminated or unverified vials carry serious infection risks. You can explore options through specialized providers like the Bacteriostatic Water Store.