Description

 Bacteriostatic Water for Injection, USP (3 mL Fill)

Bacteriostatic Water for Injection, USP is a sterile, non-pyrogenic preparation of purified water containing 0.9% benzyl alcohol as a bacteriostatic preservative. Presented in a 3 mL single-dose or multi-dose vial, this preparation is specifically designed for the parenteral dilution or reconstitution of medications intended for injection, infusion, or further dilution.

The 3 mL fill volume addresses a critical niche in clinical and at-home therapeutic settings: small-volume reconstitution. It minimizes waste, eliminates the need to puncture larger vials (e.g., 30 mL) for micro-doses, and reduces the risk of preservative overload in pediatric or low-body-weight patients. Each vial delivers precisely 3 mL of sterile, bacteriostatic water, ensuring accurate final concentrations for sensitive biotech drugs, peptides, hormones, and research compounds.

Key Features & Specifications

Mechanism of Action: Why Benzyl Alcohol?

The distinguishing feature of bacteriostatic water is 0.9% benzyl alcohol. This aromatic alcohol acts as a static agent, inhibiting the proliferation of introduced microorganisms (e.g., Staphylococcus aureus, Pseudomonas aeruginosa, Candida albicans) that may enter the vial during repeated needle punctures. Unlike sterile water for injection (which lacks preservatives and is strictly single-use), the 3 mL bacteriostatic water vial can be accessed multiple times over 28 days when aseptic technique is observed. However, given the small volume, it is typically used for 1–3 entries.

Important Clinical Note: Benzyl alcohol is contraindicated in neonates, infants, pregnant women (especially in the first trimester), and patients with benzyl alcohol hypersensitivity. It has been associated with the “Gasping Syndrome” in low-birth-weight infants. For these populations, use Sterile Water for Injection (preservative-free) .

Primary Applications for 3 mL Vials

The 3 mL size is not arbitrary—it solves specific pain points in precision medicine:

1. Peptide & Hormone Reconstitution

• GLP-1 Agonists (Semaglutide, Tirzepatide): Typical lyophilized peptide doses require 1–3 mL diluent. A 3 mL vial provides exact volume for a full reconstitution cycle without leftover preservative water that might degrade over time.

• Growth Hormone Releasing Hormone (GHRH) / Sermorelin: Standard 2 mg vials reconstitute beautifully with 2–3 mL bacteriostatic water.

• HCG (Human Chorionic Gonadotropin): 3 mL allows for precise dosing (e.g., 500 IU per 0.1 mL).

2. Intradermal & Subcutaneous Testing

• Allergy skin testing: Dilution of allergens to 1:100 or 1:1000 w/v. The 3 mL volume reduces waste of expensive allergen extracts.

• TB (Tuberculin) skin test reconstitution: PPD (Purified Protein Derivative) vials often require 1–3 mL diluent.

3. Intra-articular & Small-Volume Injections

• Joint injections (e.g., Hyaluronic acid or corticosteroid mixing): Orthopedists frequently need 1–3 mL to reconstitute powdered steroids (e.g., triamcinolone acetonide) for knee, shoulder, or finger joints.

• Trigger point injections: Diluting local anesthetics or botulinum toxin for precise small-muscle administration.

4. Research & Compounding Pharmacy

• Veterinary compounding: Small animal doses (cats, small breed dogs) often require <2 mL total volume. A 3 mL vial prevents waste of larger 30 mL bottles.

• IV admixture simulation: Training settings for pharmacy technicians learning aseptic technique without expensive drug products.

Step-by-Step Aseptic Reconstitution Protocol

Adherence to sterile technique is mandatory. Failure introduces pathogens despite bacteriostatic action.

1. Inspect the vial: Ensure solution is clear, colorless, and free from particles. Discard if turbid or if seal is damaged.

2. Hand hygiene: Wash hands; don sterile gloves if compounding for injection.

3. Disinfect stopper: Swab rubber stopper with 70% isopropyl alcohol. Allow 30 seconds to dry.

4. Draw air: Into a sterile syringe (1 mL, 3 mL, or 5 mL Luer-Lok), draw air equal to the volume of diluent you intend to withdraw.

5. Insert needle: Pierce the stopper at a 45–60° angle to prevent coring. Inject air into the vial headspace to equalize pressure.

6. Withdraw diluent: Invert vial, keep needle tip below liquid surface, and withdraw desired volume (e.g., 2.5 mL).

7. Reconstitute drug: Inject bacteriostatic water slowly into lyophilized drug vial (aim down the glass side to avoid foaming). Swirl gently—do not shake.

8. Discard remainder: The 3 mL vial is intended for short-term use. Any unused portion after 28 days must be discarded, even if volume remains.

Safety & Handling Information

Contraindications

• Do not use for intrathecal, epidural, or intracisternal injections. Benzyl alcohol is neurotoxic in cerebrospinal fluid.

• Do not use in neonates (preterm and term) – risk of metabolic acidosis, neurological deterioration, and gasping syndrome.

• Do not use as a standalone IV infusate (never inject bacteriostatic water undiluted intravenously – it is not a plasma expander and causes hemolysis if infused pure).

Adverse Reactions (Rare with Proper Use)

• Local: Mild injection site irritation, burning (due to benzyl alcohol).

• Systemic: Hypotension, hyperbilirubinemia (in susceptible infants), contact dermatitis.

Compatibility Notes

• Compatible with most water-soluble drugs: Heparin, insulin, most antibiotics (vancomycin, ceftriaxone), peptides.

• Incompatible with: Amphotericin B (requires sterile water without preservatives), certain chemotherapy agents (check package insert).

Storage & Stability

• Unopened vial: Store at controlled room temperature 20°C–25°C (68°F–77°F). Protect from freezing and light.

• Opened vial (in-use): After first puncture, the bacteriostatic property suppresses microbial growth for 28 days at room temperature. Write the date of opening on the vial label. Discard after 28 days even if solution remains clear.

• Do not refrigerate after opening – cold temperatures may cause benzyl alcohol to become less effective and potentially precipitate? (Note: Brief refrigeration does not harm sterility, but stability studies show best preservative action at room temp.)

Comparison: 3 mL vs. Larger Sizes

Frequently Asked Questions

Q: Can I use this 3 mL vial for multiple injections over several weeks?
A: Yes, provided you use a sterile needle/syringe each time and swab the stopper. The benzyl alcohol prevents bacterial growth for 28 days. However, the small volume (3 mL) typically only supports 1–3 withdrawals.

Q: Is bacteriostatic water the same as sterile water?
A: No. Sterile Water for Injection contains NO preservative and is for single-use only. Bacteriostatic water contains 0.9% benzyl alcohol and allows multiple entries. Never substitute one for the other without consulting a pharmacist.

Q: Why is 3 mL so hard to find?
A: Many manufacturers focus on 30 mL vials. The 3 mL size is specialty – used for precision medicine, peptide reconstitution, and research. It requires dedicated filling lines, making it less common but highly valued by endocrinologists and compounding pharmacists.

Q: Can I freeze leftover bacteriostatic water?
A: No. Freezing may crack the glass vial and will not extend sterility. Discard any unused portion after 28 days.

Regulatory & Quality Statements

• Manufactured in an FDA-registered, cGMP-compliant facility.

• Meets all USP <71> Sterility Tests, USP <85> Bacterial Endotoxins, and USP <797> Pharmaceutical Compounding—Sterile Preparations guidelines.

• NDC (National Drug Code): Unique 11-digit code printed on each carton and vial label for traceability.

• Latex-free: Stopper contains no natural rubber latex.

• DEA exempt: Not a controlled substance.