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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

• Composition:

  • 99.1% sterile water for injection

  • 0.9% benzyl alcohol (preservative)

• Purpose of Benzyl Alcohol: Prevents bacterial growth, extending shelf life once opened.

Uses

• Diluting Medications & Peptides: Common in reconstitution of freeze-dried (lyophilized) peptides, hormones, or other injectable drugs.

• Multiple-Dose Vials: Allows a single vial to be used multiple times without contamination, unlike sterile water (which must be discarded after one use).

• Lab & Research Applications: Used where sterile, bacteria-inhibiting water is needed for mixing solutions.

Advantages

• Extended Usability: Can be used for up to 28 days after opening when stored properly.

• Reduced Waste: Multiple withdrawals from the same vial save time and resources.

• Bacterial Protection: Benzyl alcohol prevents most bacteria from multiplying in the solution.

Storage & Handling

• Store at 20–25°C (68–77°F), away from direct sunlight.

• Keep the vial tightly sealed.

• Always use a sterile needle when drawing water.

• Discard if cloudy, discolored, or past expiration.

Important Notes

• Not for infants under 1 month old: Benzyl alcohol can cause toxicity in newborns.

• For injection or research use: Should be used only as directed by a healthcare provider or in controlled lab settings.

• Do not use if seal is broken before first use.