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            "q": "What is bacteriostatic water?",
            "a": "Bacteriostatic water is sterile water with benzyl alcohol added as a preservative, supplied in a multiple-dose vial. One Hospira label lists 0.9% (9 mg/mL) or 1.1% (11 mg/mL) benzyl alcohol."
        },
        {
            "q": "What is the difference between bacteriostatic water and sterile water?",
            "a": "Bacteriostatic water contains benzyl alcohol and comes in a multiple-dose container. The Cardinal Health sterile water label says it has no bacteriostat or antimicrobial agent and comes only in single-dose containers."
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            "q": "What preservative is in bacteriostatic water?",
            "a": "Benzyl alcohol. The Hospira bacteriostatic water label lists it at 0.9% (9 mg/mL) or 1.1% (11 mg/mL), added as a bacteriostatic preservative."
        },
        {
            "q": "Does sterile water contain a preservative or antimicrobial agent?",
            "a": "No. The Cardinal Health sterile water label states the product contains no bacteriostat, antimicrobial agent or added buffer, and is supplied only in single-dose containers."
        },
        {
            "q": "Why are multiple-dose vials preserved?",
            "a": "A multiple-dose vial is entered repeatedly, so a preservative gives it protection across those entries. A 2007 review found phenol and benzyl alcohol are the most common preservatives in peptide and protein products."
        },
        {
            "q": "How long does an opened bacteriostatic water vial last?",
            "a": "Our Bacteriostatic water 30 ml listing gives a 28-day use window after first entry. For any other product, follow the window printed on its own label."
        },
        {
            "q": "What should I check on a bacteriostatic water label?",
            "a": "Look for the product name, benzyl alcohol as an ingredient, the benzyl alcohol percentage, and the words multiple-dose. A missing item may mean you hold sterile water."
        }
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