Michelle Karcher
Bacteriostatic water is a sterile solution commonly used in medical settings for the reconstitution or dilution of certain medications when permitted by the medication’s prescribing information. The 10 mL presentation manufactured by Hospira (a Pfizer company) is one of the products healthcare professionals may encounter in hospitals, clinics, and pharmacies.
Understanding what this product is—and what it is not intended for—is important for patient safety.
What Is Bacteriostatic Water?
Bacteriostatic water for injection is sterile water that contains a small amount of a bacteriostatic preservative (typically benzyl alcohol) to help inhibit the growth of certain bacteria after the vial has been entered.
Healthcare professionals may use it to dissolve or dilute medications that are specifically labeled as compatible with bacteriostatic water.
Key characteristics
- Sterile water
- Contains a bacteriostatic preservative
- Supplied in multi-dose vials
- Used for approved medication preparation in clinical settings
What Does the 10 mL Size Mean?
The 10 mL designation refers to the volume of solution contained in the vial. Multi-dose vials are designed to be accessed more than once within the manufacturer’s recommended handling guidelines.
How Is It Used?
Hospira bacteriostatic water is generally used by healthcare professionals for tasks such as:
- Reconstituting certain powdered medications
- Diluting medications before administration
- Preparing doses according to approved prescribing information
Important safety note
Not every medication is compatible with bacteriostatic water. Healthcare professionals must follow the medication’s official labeling and institutional protocols.
When Is It Not Appropriate?
Because it contains a preservative, bacteriostatic water is not suitable for all patients or all routes of administration. For example, certain populations and clinical situations may require preservative-free sterile water instead.
Decisions about which diluent to use should be made by qualified healthcare professionals.
Storage and Handling
General handling principles include:
- Store according to the manufacturer’s labeling
- Maintain sterility when accessing the vial
- Use aseptic technique
- Discard the vial according to institutional or manufacturer guidelines when appropriate
Potential Risks and Precautions
Improper use of bacteriostatic water can lead to serious problems, including:
- Medication preparation errors
- Contamination
- Inappropriate administration
- Adverse reactions related to preservatives
Anyone preparing injectable medications should receive appropriate training and follow local healthcare regulations.
Frequently Asked Questions
1. Is bacteriostatic water the same as normal saline?
No. Normal saline contains sodium chloride, while bacteriostatic water is sterile water with a preservative.
2. Can it be used for every injectable medication?
No. Only medications that are specifically labeled as compatible should be prepared with it.
3. Why does it contain a preservative?
The preservative helps inhibit bacterial growth after the vial has been entered multiple times.
4. Is it the same as sterile water for injection?
No. Sterile water for injection is typically preservative-free, while bacteriostatic water contains a preservative.
5. Can patients decide on their own which diluent to use?
No. The choice of diluent should be determined by a qualified healthcare professional.
6. What should I do if I have questions about a medication preparation?
Consult a pharmacist, physician, or other licensed healthcare professional.
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