What it is
This entry refers to the 0.9% benzyl-alcohol bacteriostatic-water presentation, equivalent to 9 mg/mL. It is a drug diluent, not a peptide, hydration treatment or standalone injectable therapy1.
Bacteriostatic preservation limits bacterial growth but is incomplete protection against contamination. Medication compatibility and aseptic technique remain essential1,2.
Label & handling evidence
The manufacturer’s label supplies composition, compatible-use and storage information. This entry uses authoritative labeling and CDC guidance rather than pretending the supply has a peptide clinical-trial dossier1,2.
CDC summarizes USP guidance: date the opened multi-dose vial and generally discard it within 28 days unless the manufacturer specifies a different interval. The original expiration date is still an outer limit, and suspected contamination overrides any calendar window2.
Compatible reconstitution1
Provides an aqueous vehicle when the medication’s instructions specifically permit it.
Preservative supports repeated access under aseptic conditions, not unlimited use.
A clear discard rule2
Opened multi-dose vials are generally dated and discarded within the usual window unless labeling specifies otherwise; contamination requires earlier disposal.
Essential precautions
Do not administer bacteriostatic water alone intravenously; the label warns that doing so can cause hemolysis. Do not use the benzyl-alcohol-containing product in neonates1.
A preservative does not validate compatibility with every peptide or rescue a compromised seal, cloudy liquid or improper handling. Reconstituted medication has its own beyond-use date, which is not automatically the diluent’s opened-vial window1,2.
- Not for use in neonates because it contains benzyl alcohol [1].
- Do not inject the diluent alone intravenously; hemolysis can occur [1].
- Use only a medication-compatible diluent and follow the pharmacy’s instructions.
- Preservative does not replace aseptic technique; discard if sterility is uncertain [2].
Reconstitution & storage
The referenced bacteriostatic-water label specifies storage at 20–25°C. Follow the actual supplied diluent label and the medication’s separate instructions; some medication preparations require a different sterile vehicle1.
Reconstitution dissolves the medication using its specified diluent and volume. Use a new sterile needle and syringe and aseptic technique for every access; ask the pharmacy to verify the resulting concentration and storage. Dosing is set by your provider1,2.
Questions
Bacteriostatic or sterile water?
Sterile water has no bacteriostatic preservative. The medication’s instructions, not a general preference, determine which is compatible.
Does the opened-vial window apply to reconstituted peptide?
Not automatically. The medication’s stability and beyond-use date are separate from the diluent’s handling window.
Can it be used with every catalog vial?
No universal compatibility is established. Use only the diluent the dispensing pharmacy specifies for the actual preparation.
What does benzyl alcohol do?
It limits bacterial growth during appropriate multi-dose handling; it does not eliminate all contamination risks.
References
- 1.Guidance / label
Bacteriostatic Water for Injection, USP: prescribing information (opens in a new tab)
Hospira, Inc.. Regulatory guidance / prescribing information, 2019.
The 0.9% presentation contains 9 mg/mL benzyl alcohol, is supplied for compatible drug dilution, is not for neonates or direct standalone intravenous injection, and is stored at 20–25°C.
- 2.Guidance / label
Preventing Unsafe Injection Practices (opens in a new tab)
Centers for Disease Control and Prevention. Regulatory guidance / prescribing information, 2024.
Use aseptic technique and a new sterile needle and syringe; opened multi-dose vials generally have a 28-day discard window unless the manufacturer specifies otherwise, never beyond original expiration.
Research summaries are educational and describe published studies, many in animal or cell models. They are not claims that this product treats any condition. Compounded medications are prepared by a licensed 503A pharmacy for individual patients and are not FDA-approved. Statements on this site have not been evaluated by the FDA. Products are dispensed only after review by a licensed provider. This site does not provide medical advice; talk to your provider before starting any therapy.