Bacteriostatic water (often abbreviated as bac water) is a sterile, non-pyrogenic water solution containing a small amount of benzyl alcohol (typically 0.9%) that acts as a preservative. It’s primarily used in medical, research, and peptide preparation settings.
Here’s a clear breakdown:
What It Is
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Composition:
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99.1% sterile water for injection
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0.9% benzyl alcohol (preservative)
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Purpose of Benzyl Alcohol: Prevents bacterial growth, extending shelf life once opened.
Uses
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Diluting Medications & Peptides: Common in reconstitution of freeze-dried (lyophilized) peptides, hormones, or other injectable drugs.
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Multiple-Dose Vials: Allows a single vial to be used multiple times without contamination, unlike sterile water (which must be discarded after one use).
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Lab & Research Applications: Used where sterile, bacteria-inhibiting water is needed for mixing solutions.
Advantages
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Extended Usability: Can be used for up to 28 days after opening when stored properly.
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Reduced Waste: Multiple withdrawals from the same vial save time and resources.
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Bacterial Protection: Benzyl alcohol prevents most bacteria from multiplying in the solution.
Storage & Handling
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Store at 20–25°C (68–77°F), away from direct sunlight.
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Keep the vial tightly sealed.
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Always use a sterile needle when drawing water.
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Discard if cloudy, discolored, or past expiration.
Important Notes
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Not for infants under 1 month old: Benzyl alcohol can cause toxicity in newborns.
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For injection or research use: Should be used only as directed by a healthcare provider or in controlled lab settings.
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Do not use if seal is broken before first use.




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