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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.
