Bacteriostatic Water for Injection, 30mL multi-dose vial — preserved sterile water for peptide reconstitution and multi-dose injectable preparation.
Bacteriostatic Water for Injection (BWFI) is sterile water containing 0.9% benzyl alcohol as a preservative. The benzyl alcohol inhibits microbial growth after the vial is punctured, which is what makes multi-dose use possible — unlike plain sterile water, which must be discarded after a single use. This is the standard diluent for reconstituting peptides and other injectable medications that will be drawn from the same vial across multiple doses over days or weeks. Available in a 30mL multi-dose vial.
| Specification | Detail |
|---|---|
| Active ingredient | Water for Injection, USP |
| Preservative | Benzyl Alcohol 0.9% |
| Sodium chloride | None |
| Volume | 30 mL multi-dose vial |
| Osmolarity | Hypotonic |
| Storage | Room temperature; protect from freezing |
| Prescription status | Rx only |
Legere supplies licensed medical practices with a range of quantities to fit your volume needs. To get pricing, check availability, or place an order, click Request a Quote above or contact our team directly. A valid medical or pharmacy license is required to purchase prescription and injectable products.
Legere stocks three complementary injectable diluents. Each fits different clinical situations.
| Bacteriostatic Water 30mL (This product) | Sterile Water for Injection 10mL | Bacteriostatic Sodium Chloride 0.9% 10mL | |
|---|---|---|---|
| Preservative | Benzyl alcohol 0.9% | None | Benzyl alcohol 0.9% |
| Sodium chloride | None | None | Yes — 0.9% (isotonic) |
| Multi-dose | Yes | No — single use only | Yes |
| Osmolarity | Hypotonic | Hypotonic | Isotonic |
| Volume | 30 mL | 10 mL | 10 mL |
| Best for | Peptide reconstitution; multi-dose injectables drawn over days or weeks | Single-session use; benzyl alcohol-free requirement | Medications requiring isotonic saline as the vehicle |
The key reason to choose Bacteriostatic Water over plain Sterile Water: The benzyl alcohol preservative. Once a vial of plain sterile water is punctured, bacteria can enter and the vial must be discarded. Bac Water can be punctured multiple times safely because the benzyl alcohol prevents microbial growth between uses. For any injectable medication that will be reconstituted in a vial and drawn from across multiple days — which describes most peptide protocols — Bacteriostatic Water is the correct diluent.
Men’s health, TRT, and peptide practices: Bacteriostatic Water is the standard reconstitution diluent for sermorelin, gonadorelin, and other peptides used in hormone and longevity protocols. Most peptide vials contain lyophilized (freeze-dried) powder that must be dissolved before injection — Bac Water is the preferred vehicle because it maintains sterility across the multiple draws a single peptide vial requires.
IV therapy and wellness clinics: Practices that reconstitute injectable medications as part of IV protocols use Bacteriostatic Water where the medication’s instructions specify sterile water and multi-dose use is needed.
Longevity and anti-aging practices: Any practice working with peptides — BPC-157, thymosin, sermorelin, CJC-1295, and related compounds — requires Bacteriostatic Water as a standard supply item. It is one of the most consistently reordered items in a peptide practice.
Compounding-adjacent clinical practices: Practices that prepare multi-dose injectable medications in-house for patient administration routinely use Bacteriostatic Water as the reconstitution vehicle for products that specify water-based dilution.
Sermorelin Acetate Injection — Sermorelin is supplied as a lyophilized powder and requires reconstitution with bacteriostatic water before subcutaneous or intramuscular injection. The 30mL vial of bacteriostatic water provides sufficient diluent for an extended Sermorelin protocol.
Gonadorelin Peptide Injection — Gonadorelin is similarly supplied as lyophilized powder for reconstitution. Practices running both Sermorelin and Gonadorelin protocols will use bacteriostatic water for both.
Sterile Water for Injection 10mL — The single-dose complement. Practices that need both multi-dose and single-dose reconstitution capability — or that have medications specifying preservative-free water — stock both.
Neonates — absolutely contraindicated: Benzyl alcohol is toxic to neonates and premature infants and can cause fatal gasping syndrome. Bacteriostatic Water must never be used in neonates or premature infants under any circumstances.
Single-dose only for neonates and premature infants — use preservative-free Sterile Water instead.
Multi-dose vial handling — aseptic technique required: The benzyl alcohol preservative inhibits microbial growth but does not sterilize a contaminated vial. Proper aseptic technique on every draw is still essential. Discard the vial per the manufacturer’s recommended beyond-use date after first puncture — typically 28 days when stored at room temperature and handled correctly.
Confirm diluent compatibility: Not every medication is compatible with benzyl alcohol. Some medications are sensitive to benzyl alcohol as an excipient and require preservative-free Sterile Water instead. Always check the drug’s reconstitution instructions before using Bacteriostatic Water.
Not for direct IV infusion: Bacteriostatic Water is hypotonic and is a reconstitution vehicle, not an infusion fluid. The final reconstituted or diluted solution must achieve appropriate tonicity for the intended route before administration.
For use by or on the order of a licensed healthcare provider.
How do I order, and what quantities are available?
Contact our team directly to place an order or request a quote. We supply a range of quantities depending on the product — reach out for current availability, lead times, and volume pricing. A valid medical license is required to purchase prescription and injectable products.
Why is Bacteriostatic Water the standard diluent for peptides?
Most peptide protocols involve reconstituting a single vial and drawing from it across multiple doses over days or weeks. Plain Sterile Water has no preservative — once punctured, it cannot be safely reused because bacteria can enter the vial. Bacteriostatic Water’s benzyl alcohol preservative prevents microbial growth between draws, making multi-dose reconstitution safe. For any peptide vial that will be used more than once, Bacteriostatic Water is the correct choice.
What is the difference between Bacteriostatic Water and Bacteriostatic Sodium Chloride?
Both are multi-dose vials with benzyl alcohol preservative. The difference is the vehicle: Bacteriostatic Water is non-ionic and hypotonic — appropriate for medications that require a water-based, non-saline diluent. Bacteriostatic Sodium Chloride is isotonic normal saline — appropriate for medications that require isotonic saline as the vehicle. The drug’s reconstitution instructions determine which to use.
Can Bacteriostatic Water be given directly by injection without a drug mixed in?
No. Bacteriostatic Water is a reconstitution vehicle, not an injectable solution on its own. It is hypotonic and must always be used to dissolve or dilute a drug before administration. The reconstituted drug solution achieves appropriate concentration and osmolarity through the drug itself.
Is a prescription required?
Yes. Bacteriostatic Water for Injection is Rx only, available exclusively to licensed healthcare providers and medical practices.
This is a compounded medication. Compounded drugs are not FDA-approved and have not been evaluated by the FDA for safety, efficacy, or quality. This product is available by prescription only and is intended for use by or on the order of a licensed healthcare provider.
Schedule a no obligation/no-pressure call to quickly increase your weight loss clinic’s revenue.
