Bacteriostatic Water

Product details

This is genuine Bacteriostatic Water for Injection, USP (a Pfizer company) — pharmaceutical-grade bacteriostatic water sourced directly through a licensed U.S. laboratory partner. It is the same sterile diluent supplied to hospitals, clinics, and compounding pharmacies, not repackaged or gray-market product.

What bacteriostatic water is

Bacteriostatic water is a sterile, nonpyrogenic preparation of water for injection that contains 0.9% (9 mg/mL) benzyl alcohol added as a bacteriostatic preservative. That preservative is what separates bacteriostatic water from plain sterile water: it suppresses the growth of bacteria inside the vial, which allows a multi-dose container to be entered and drawn from repeatedly over time while staying sterile between withdrawals. Each batch meets the United States Pharmacopeia (USP) monograph for identity, purity, and pH.

Pharmaceutical-grade, straight from the source

Most bacteriostatic water sold into the research space is imported and repackaged, and that supply is tightening fast as overseas import channels close. We took a different route. Through a close laboratory partnership, this bacteriostatic water comes straight from — the same Pfizer-owned manufacturer that supplies hospitals, clinics, and compounding pharmacies across the country. You are getting verified, lot-traceable pharmaceutical product, not a generic gray-market bottle. For anyone who cares about what actually goes into a reconstitution, that provenance matters, and it is the single biggest reason we made the switch.

How bacteriostatic water is used

In a research setting, bacteriostatic water is used to reconstitute lyophilized (freeze-dried) compounds back into solution prior to study. The researcher draws the desired volume of bacteriostatic water and adds it slowly down the side of the powder vial, allowing the compound to dissolve gently without agitation or foaming. Because this is a multi-dose preparation, a single 10 mL vial of bacteriostatic water can support several reconstitutions depending on the volume drawn each time. Always follow the handling instructions for the specific compound being prepared.

Bacteriostatic water vs. sterile water

Plain sterile water for injection contains no preservative, so once its vial is opened it should be used immediately and discarded. Bacteriostatic water, by contrast, carries the benzyl alcohol preservative, which is exactly why it is the standard choice when a vial needs to be accessed more than once. For multi-step reconstitution work, bacteriostatic water is almost always the more practical and economical option, which is why it is the default diluent across laboratories and clinics.

Storage and handling

Store bacteriostatic water at controlled room temperature and keep the vial sealed until first use. After the stopper is first entered, the benzyl alcohol preservative keeps the contents sterile for a typical multi-dose window — refer to the manufacturer labeling for the exact in-use period. Inspect every vial before use: the solution should be clear and free of particulates, and any vial that is cloudy, discolored, or otherwise compromised should be discarded.

Specifications

• Product: Bacteriostatic Water for Injection, USP
• Preservative: 0.9% benzyl alcohol (9 mg/mL)
• Format: 10 mL multi-dose vial
• pH: 5.7 (range 4.5–7.0)
• Quality: USP grade · sterile · nonpyrogenic
• Source: licensed U.S. laboratory partner

Bacteriostatic water pairs with any lyophilized research compound in our catalog. For research and laboratory use only. Not for human or veterinary use.

Frequently asked

How much does a 10 mL vial of bacteriostatic water provide? Plenty for repeated reconstitutions — researchers typically draw a fraction of a milliliter up to a couple of milliliters per preparation, so a single multi-dose vial covers several compounds. Is this the same bacteriostatic water hospitals use? Yes — it is genuine product sourced through a licensed laboratory, the identical USP-grade diluent used in clinical settings. Browse the compounds it pairs with in our research compound catalog, and see the official USP monograph.