The Hospira bacteriostatic water 25 pack is a bulk supply of 30 mL vials with 0.9% benzyl alcohol. Learn what's inside, how to store it, and who can buy it.
The Hospira bacteriostatic water 25 pack is a case of 25 glass vials, each holding 30 mL of sterile water preserved with 0.9% benzyl alcohol. It is used to reconstitute powdered medications and peptides so they can be measured and drawn into a syringe. In the United States, Hospira bacteriostatic water is a prescription product and is not sold over the counter.
What Hospira Bacteriostatic Water Actually Is
Bacteriostatic water is sterile water with a small amount of benzyl alcohol added. The water itself is already sterile; the alcohol is there to discourage bacterial growth if the vial is entered more than once. That single detail is what separates it from plain sterile water.
Hospira, now part of Pfizer, packages the product in 30 mL multi-dose vials. A 25 pack is a bulk case of identical vials, typically bought by clinics, compounding pharmacies, and research labs rather than by individual patients.
Two labeling limits matter: Hospira bacteriostatic water is not intended for intravenous infusion, and it is not for use in newborns because of the benzyl alcohol content.
What Is Inside the 25 Pack
The 25 pack contains no accessories, just the vials. Here is what the packaging generally specifies.
| Specification | Detail |
|---|---|
| Vials per pack | 25 |
| Fill volume | 30 mL per vial |
| Preservative | 0.9% benzyl alcohol |
| Base solution | Sterile Water for Injection, USP |
| Container | Glass multi-dose vial with rubber stopper |
| Typical use | Reconstituting powders, peptides, and compounded injectables |
| Unopened storage | Controlled room temperature, protect from light and freezing |
| After first puncture | Discard 28 days after first entry |
A 25 pack holds 750 mL of diluent in total. Very few individual users will get through that volume before the vials expire, which is why bulk cases are usually a clinic or laboratory purchase.
Unopened Hospira bacteriostatic water is stable until the expiration date printed on the vial, which is generally two to three years out.
What Bacteriostatic Water Is Used For
Bacteriostatic water is a diluent, not a medication. It has no therapeutic effect on its own and exists only to turn a powder into an injectable solution.
People looking for the best bac water for peptides usually weigh three things: preservative content, vial size, and whether the product is pharmaceutical grade. Hospira 30 mL vials check all three boxes for most non-IV uses. The same product is common with human growth hormone, laboratory reference standards, and some compounded injectables.
Reconstitution in practice
Compounded products are sometimes dispensed as a powder that has to be mixed before use. A starter dose such as 0.25 semaglutide is a typical example of the measurement a patient sees after the powder is dissolved. The final concentration depends entirely on how much diluent is added, so the prescriber or pharmacy instructions should always be followed exactly.
Researchers comparing compounds such as aod 9604 vs mots-c often use the same diluent for both, because the choice of water depends on whether the vial needs to be entered more than once, not on the peptide itself.
Hospira vs. Other Reconstitution Diluents
| Product | Preservative | Multi-dose? | Typical use |
|---|---|---|---|
| Hospira bacteriostatic water | 0.9% benzyl alcohol | Yes, 28 days after first entry | Peptides, HGH, compounded powders |
| Sterile Water for Injection, USP | None | No, single use | Immediate use, IV dilution |
| 0.9% sodium chloride (saline) | None | No, single use | IV fluids, some dilutions |
| Compounding pharmacy bac water | Usually 0.9% benzyl alcohol | Yes | Similar role to Hospira |
If a medication is meant to be used once and immediately, plain sterile water or saline is usually the correct choice. If the vial will be entered multiple times, a preserved diluent is the standard.
Preservative-free diluents are required for certain patients, including newborns and anyone with a benzyl alcohol sensitivity.
Where the 25 Pack Is Sold
Hospira bacteriostatic water reaches end users through licensed distributors and pharmacies, not through typical retail channels. A search for bacteriostatic water walgreens often ends the same way, since chain pharmacies generally do not keep it on the shelf, though some locations can special order it with a prescription.
Legitimate sources include:
- A prescription filled at a retail or compounding pharmacy
- Licensed medical distributors that require a professional account
- Laboratory supply companies, for non-human research use
Bulk 25 packs cost less per vial than single vials. That savings only makes sense if the vials will actually be used before they expire.
Storage and Shelf Life
Unopened vials should be kept at controlled room temperature, out of direct light, and never frozen. The printed expiration date applies only while the seal is intact.
Once the rubber stopper is punctured, the clock starts. Anyone wondering how long is bac water good for in the fridge should understand that refrigeration slows bacterial growth but does not extend the 28-day limit in the labeling.
Basic handling rules:
- Swab the stopper with alcohol and let it dry before each entry.
- Use a new needle for every draw.
- Write the first-use date on the vial.
- Discard the vial 28 days after the first puncture, or sooner if the liquid is cloudy or contains particles.
- Never pool leftover water from different vials.
Bacteriostatic water should not be used if it is discolored or shows visible particles, no matter how recently the vial was opened.
Safety Notes Before You Buy
Benzyl alcohol has been linked to serious adverse reactions in newborns and premature infants. Hospira bacteriostatic water is not appropriate for neonatal use, and preservative-free options are preferred in that setting.
Multi-dose vials carry a contamination risk that grows with every puncture. The 28-day rule comes from clinical handling standards, and home handling is not always as clean. Some clinicians recommend shorter windows for patients who mix medications at home.
Hospira bacteriostatic water is a diluent, not a treatment for any medical condition. Anyone injecting a reconstituted product should confirm the diluent, mixing volume, and storage requirements with a licensed pharmacist or healthcare professional.
Frequently Asked Questions
Can you buy the Hospira bacteriostatic water 25 pack without a prescription?
In the United States, Hospira Bacteriostatic Water for Injection is a prescription product. Most retail pharmacies do not stock it, and licensed medical distributors require a verified professional account. A prescription or a professional account is the normal route to purchase.
How long does a 25 pack of bacteriostatic water last?
Unopened vials remain usable until the expiration date printed on the label, which is usually about two to three years after manufacture. Once a vial is punctured, it should be discarded 28 days after the first entry, even if it still looks full.
Is bacteriostatic water the same as sterile water?
No. Sterile water for injection contains no preservative and is intended for single use only. Bacteriostatic water contains 0.9% benzyl alcohol, which inhibits bacterial growth and allows the same vial to be entered more than once within the labeled 28-day window.
This page provides educational research information and does not replace medical advice, diagnosis, or treatment.