Bacteriostatic Sodium Chloride 0.9% Injection is a sterile normal saline solution (0.9% sodium chloride in water) that contains a small amount of a bacteriostatic preservative. In most formulations, the preservative is benzyl alcohol (0.9% benzyl alcohol per mL), which inhibits the growth of bacteria. The presence of this preservative keeps the solution sterile between uses, allowing the product to be packaged in a multiple-dose vial for repeated withdrawals without contamination. In other words, bacteriostatic means itprevents bacteria from growing, so the same vial of saline can be used multiple times (within its recommended timeframe) instead of being single-use
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Benzyl Alcohol + Uses full definition, benzyl alcohol mechanism, USP spec Bacteriostatic Water vs Sterile Water: Which to Use multi-dose vs single-use comparison Where to Buy Bacteriostatic Water (Pharmaceutical Grade) verifying USP spec at purchase How to Store Bacteriostatic Water (Pre + Post Puncture) full storage reference including travel, light exposure, and multi-dose handling References Pfizer/Hospira
The research and formulation guidance converge on specific ranges that balance efficacy with safety