Hospira Bacteriostatic Water: Vial Sizes, the Label, and Where to Buy It

Hospira is the name on most of the bacteriostatic water vials in circulation, and someone asking for Hospira bac water almost always means one specific product: Bacteriostatic Water for Injection, USP. Sterile water with benzyl alcohol 0.9 percent added as a preservative, nothing else, in multiple-dose vials of 10 mL and 30 mL, prescription only in the United States, with a documented 28 day in-use limit once the stopper has been punctured. Hospira, Inc. is a Pfizer subsidiary, which is why the same vial turns up under both names.

This page covers the product itself: which vial size you need, what the label means, where the 28 day number comes from, how it compares with sterile water and with the bottles vendors sell as reconstitution solution, where to buy it, and how to tell a genuine vial from a repackaged one. Why a preservative is used at all, and the mechanics of mixing, are in the BAC water guide and the reconstitution guide.

What Hospira Bacteriostatic Water Is, and the Pfizer Relationship

Hospira, Inc. was spun out of Abbott Laboratories in 2004 as a standalone hospital products company: generic injectables, infusion pumps, and the unglamorous sterile fluids hospitals buy by the pallet. Pfizer acquired it in 2015, and the business has been Hospira, a Pfizer company, since. That is the whole of the relationship, and it is why "pfizer bacteriostatic water" and "hospira bacteriostatic water" are usually two names for the same vial.

The Abbott lineage also explains something useful. An NDC, the National Drug Code identifying a US drug product, begins with a labeler code assigned to the responsible company. Hospira's is 0409, inherited from Abbott, so a genuine Hospira vial carries an NDC starting 0409. That one detail does more counterfeit screening work than anything else on the label.

The product is plain: Sterile Water for Injection with benzyl alcohol 0.9 percent, 9 mg per mL, added as a bacteriostatic preservative. No sodium chloride, no buffer, no tonicity agent, no stabiliser. It is a diluent and the labeling treats it as one, carrying the standard direction that the final preparation be made approximately isotonic before use, because the water alone is not.

Worth saying plainly: Hospira is a manufacturer, not a grade. There is no tier called "Hospira quality". Any manufacturer making the same United States Pharmacopeia monograph product is making the same thing, and the name carries weight here only because it is the vial people recognise.

The 10 mL and 30 mL Vials, and Which One You Actually Need

Hospira supplies bacteriostatic water in multiple-dose fliptop vials in two sizes, 10 mL and 30 mL. The solution is identical. The 30 mL is considerably cheaper per millilitre everywhere it is sold, which makes it look like the obvious buy and is the most common purchasing mistake on this product.

Start with the arithmetic that ignores time. The number of vials a bottle fills is the bottle volume divided by the volume you add per vial.

Now put the clock back in. Those counts are theoretical capacity, and the real limit is whichever runs out first, the volume or the 28 days. Someone working through one 10 mg vial at a time, reconstituting each with 2 mL, uses roughly 2 mL a month. A 30 mL bottle would take over a year to empty at that rate, and about 28 mL of it would go into a sharps bin four weeks after purchase. The 10 mL is the right buy there, and even that has waste in it.

The 30 mL earns its place in three cases: several vials open in the same four week window, which is what a multi-compound protocol looks like; large vials taking 3 to 5 mL each; or more than one person drawing from the same bottle. Outside those, the per millilitre saving is not a saving, because you do not keep the part you throw away.

How to Read a Hospira Bacteriostatic Water Label

Every line on the vial is load bearing, and most people never read past the first one. Working down it in order.

Bacteriostatic Water for Injection, USP

The USP suffix is the important half. It means the product is made to the United States Pharmacopeia monograph of that name, which fixes composition, purity limits and testing. That is what separates a registered drug product from a clear liquid someone filtered into a vial. A label reading "bacteriostatic water" with no USP designation is telling you something.

Benzyl Alcohol 0.9% added as preservative

The only ingredient besides water, at 9 mg per mL. Bacteriostatic means growth suppressing, not killing: it holds the small population introduced by an imperfectly swabbed stopper in check so it cannot multiply between punctures. It does not sterilise the contents and will not rescue a substantially contaminated vial. The BAC water guide covers the preservative in full, including that benzyl alcohol solutions are not for use in neonates.

Multiple-dose

The hook the in-use limit hangs off. A multiple-dose container is one the labeling contemplates being entered more than once, which is only possible because of the preservative. Sterile Water for Injection comes in single-dose containers with no preservative and is discarded after one entry regardless of what is left.

The NDC

Three hyphenated segments: labeler, product, package. The labeler code identifies the company and Hospira's is 0409. The package code identifies the container, which is why the 10 mL and the 30 mL carry different NDCs though the liquid is the same. Two checks: it should begin 0409 on a Hospira vial, and it should match the carton.

Lot number, expiry date and Rx only

Lot and expiry appear on both the vial and the carton, and they should agree. The expiry is the unopened shelf life, typically two to three years from manufacture, and has nothing to do with the 28 day figure covered next. A vial with no lot number is not a pharmaceutical product, whatever else the label says. The "Rx only" line is a legal classification rather than a comment on hazard, and it is the reason the buying section below has three routes instead of one.

The 28 Day Rule After First Puncture

Twenty-eight days from the first puncture is the in-use limit, and it is the number people get wrong most often, usually by starting the count from the wrong event.

It is not the water expiring. An unopened vial keeps to the printed expiry date. The 28 days is a limit on an entered multiple-dose container, and two things sit behind it. Preservative efficacy: benzyl alcohol at 0.9 percent is tested against the USP antimicrobial effectiveness standard, and the in-use limit says how long that suppression can be relied on under repeated puncture. And the compounding standard, USP General Chapter 797, which assigns an entered multiple-dose container a 28 day beyond-use date unless the manufacturer specifies otherwise.

Worth being precise about where it is written, because a lot of pages on this subject are not. The vial carries the multiple-dose designation and the package insert carries the discard direction. The 28 days is the figure the standard applies to that designation, not a number stamped on the front of the vial.

The practical version is one sentence: write the date on the label with a marker the moment the needle first goes through the stopper. Not the purchase date, not the date you opened the carton. Every clock in the box runs from a different event and this is the one people conflate.

Day 29 is not a cliff. A carefully handled vial is not dangerous on day 31. The problem is that a contaminated vial and a clean one look identical, no home test distinguishes them, and the cost of respecting the date is the price of a replacement. Storage in the meantime is undemanding: controlled room temperature, in its carton, out of direct light. Refrigeration is not required and does not extend the 28 days. The reconstituted peptide has its own, usually shorter clock, which the storage guide covers.

Hospira Versus Other Brands, Sterile Water and Reconstitution Solution

Hospira is the most recognised name on this product but not the only manufacturer. Other US manufacturers make Bacteriostatic Water for Injection, USP to the same monograph, and a vial from any of them is the same formulation at the same preservative concentration. Fresenius Kabi is the other name that comes up regularly. Brand preference here is familiarity, not a quality signal.

The distinction that matters is not Hospira against another brand. It is a registered drug product against a supplier-prepared solution. A vial with a manufacturer name and an NDC is a monograph product from a facility registered to make it. A bottle sold by a research supplier may be either: some resell manufacturer vials, others fill their own. Neither is necessarily wrong for the job, but the label tells you which you have, and no manufacturer name and no NDC means a lab solution.

The second distinction people ask about is bacteriostatic water against plain sterile water against the bottles sold as reconstitution solution. The first two are monograph products with a clear difference. The third is a product name rather than a monograph, which is the point to grasp about it.

That last cell answers a question that gets asked constantly. Reconstitution solution is not a defined thing. Some bottles carrying the name are bacteriostatic water relabelled, and some say so outright in the product title. Others are proprietary mixes adding sodium chloride or other excipients. The name tells you nothing; the ingredient line tells you everything. If it lists sterile water and 0.9 percent benzyl alcohol, you have bacteriostatic water under another name and the 28 day logic applies unchanged.

Where to Buy Hospira Bacteriostatic Water

The pharmacy counter

Bacteriostatic water is prescription only in the United States, so a pharmacy keeps it behind the counter, and what happens next varies enormously. Some fill it against a prescription. Some sell it at the pharmacist's discretion without one. Some will not sell to a walk-in at all. CVS and Walgreens both stock it in many locations, and "in stock" on a store website is a statement about inventory, not about whether you leave with it. Cheapest per millilitre when it works, and the least predictable. A 10 mL at the counter typically runs from a few dollars to low double digits.

Medical and veterinary supply retailers

Online medical and veterinary supply houses sell manufacturer vials, frequently by the carton, and this is the most reliable route to a genuine, cartoned, fully labelled vial. It is also where the Hospira name and NDC are most likely to be printed in the listing rather than implied. The drawback is a delivery charge on a cheap item, which is why buying a carton often beats buying one vial.

Research peptide suppliers

Most peptide suppliers carry a diluent as a catalog item, and this is where most readers buy it, for one unglamorous reason: it rides along with the compound order and avoids a second shipping charge. Suppliers list a 10 mL in roughly the high teens to mid twenties, a real markup on a cheap item and still usually the cheaper total once the shipping you did not pay is counted. What arrives is not always a Hospira vial, so check the photo and description for a manufacturer name and an NDC.

One route is deliberately left off. Third-party listings on the large consumer marketplaces are a recurring source of repackaged and mislabelled bacteriostatic water, which the next section covers. Vendor reliability generally is in the vendor scorecard, and the purchasing question in how to buy peptides.

How to Spot a Counterfeit or Repackaged Vial

This is a real problem with this product, for reasons unrelated to how valuable it is. Bacteriostatic water is cheap, the packaging is simple, demand outruns the convenient supply, and a clear liquid in a small vial is about the easiest thing in medicine to imitate. No colour to match, no viscosity to fake, no smell that gives it away. The label chain is all you have.

What a genuine manufacturer vial carries:

• A manufacturer name on the label, not only a store or brand name
• An NDC in three hyphenated segments, beginning 0409 on a Hospira vial
• The full product name, Bacteriostatic Water for Injection, USP, the preservative line naming benzyl alcohol at 0.9 percent, and the words multiple-dose
• A lot number and expiry date on the vial, matching the carton it shipped in
• An intact flip-top cap sitting flush over a stopper with no puncture mark

What should stop the purchase:

• No NDC at all, or a number that is not in three segments. The fastest single check.
• A sticker over another label, or a label that looks printed at home. Relabelling is the mechanism for most of the problem here.
• Loose vials with no carton, sold in a bag or a padded envelope with nothing else in it.
• A visible puncture mark in the stopper under the cap, or a cap that spins loosely or does not sit flush.
• Lot or expiry missing from the vial or the carton, present on one and not the other, or not matching.
• Plastic ampoules, prefilled syringes or squeeze bottles presented as bacteriostatic water. The monograph product is a stoppered vial.
• A listing titled Hospira with a generic vial in the photo. A seller holding the branded product photographs the branding.
• A price far below a pharmacy counter. This is a commodity with a thin margin at every level, and no wholesale arrangement makes it 80 percent cheaper than a chemist charges.

The repackaging problem, which is the common one

The frequent fraud here is not a fake chemical. It is a real 30 mL bottle decanted into ten smaller vials and sold as ten units. The water is genuine and will test as such. What has been destroyed is what the packaging carried: the sterility guarantee of an unopened container, and the date. The 28 day clock started when the repackager punctured the original, on a date you cannot discover, and a multi-dose container whose in-use date you cannot establish cannot be used as one. If a vial arrives with no carton, no lot number, or a cap that does not sit flush, treat it as single use.

The other quiet failure is plain sterile water relabelled as bacteriostatic. The two look identical, and the substitution stays invisible until a reconstituted vial goes cloudy three weeks later, by which point the compound in it is gone too. Nothing catches it at the point of sale except the label chain, which is the argument for the cartoned manufacturer vial even when the loose one is cheaper.

Key Takeaways

• Hospira, Inc. has been a Pfizer subsidiary since 2015, so "hospira bacteriostatic water" and "pfizer bacteriostatic water" almost always mean the same vial
• The product is Bacteriostatic Water for Injection, USP: sterile water plus benzyl alcohol 0.9 percent, nothing else, prescription only in the United States
• Hospira's NDC labeler code is 0409, and an NDC in three segments beginning 0409 is the fastest authenticity check on a label
• The two vials hold identical solution. At 2 mL per peptide vial a 10 mL fills five and a 30 mL fills fifteen, but the 28 day clock, not the volume, is usually the binding limit
• The 28 days runs from the first stopper puncture, not from purchase; write that date on the label
• Reconstitution solution is a product name, not a monograph. Read the ingredient line
• The common counterfeit is not fake water, it is a real bottle decanted into unlabelled vials with an unknowable in-use date

Frequently Asked Questions

Is Hospira bacteriostatic water the same as Pfizer bacteriostatic water?

Yes, in almost every case they are the same vial. Hospira, Inc. was spun out of Abbott Laboratories in 2004 and Pfizer acquired it in 2015, so the company is now described as Hospira, a Pfizer company. Searches for pfizer hospira bacteriostatic water and hospira bacteriostatic water land on the same product: Bacteriostatic Water for Injection, USP, sterile water with benzyl alcohol 0.9 percent added as a preservative, in multiple-dose vials. A listing using both names is not a red flag by itself, but the label should still carry a manufacturer name, an NDC beginning 0409, a lot number and an expiry date.

What is the difference between the 10 mL and 30 mL Hospira vials?

Only the volume. The solution is identical and the 30 mL is considerably cheaper per millilitre. It is not automatically the better buy because of the 28 day in-use limit, which starts the moment you first puncture the stopper. At 2 mL per peptide vial a 10 mL bottle fills five vials and a 30 mL fills fifteen, but you have to get through fifteen reconstitutions inside four weeks for the larger bottle to pay for itself. Someone opening one vial every three or four weeks uses about 2 mL a month and should buy the 10 mL.

How long is Hospira bacteriostatic water good for after opening?

Twenty-eight days from the first puncture. Unopened, the vial keeps to the expiry date printed on the label, usually two to three years from manufacture. The 28 day figure is the in-use limit for an entered multiple-dose container: it reflects how long the benzyl alcohol can be relied on to suppress growth under repeated entry, and it is the beyond-use date the USP compounding standard assigns to entered multiple-dose containers unless a manufacturer specifies otherwise. Write the puncture date on the label, because what counts is the date the needle first went in, not the purchase date.

Where can you buy Hospira bacteriostatic water?

Three routes. Retail pharmacies keep it behind the counter, since bacteriostatic water is prescription only in the United States, and whether a given pharmacy sells it without a prescription varies by state and by pharmacist, so stock on a website does not guarantee a sale. Medical and veterinary supply retailers sell manufacturer vials online, often by the carton, which is the most reliable route to a genuine vial with its packaging intact. Research peptide suppliers carry a diluent as a catalog item, which is where most readers buy it, because it ships with the compound order instead of paying a second shipping charge.

How do you tell if a Hospira bacteriostatic water vial is genuine?

Work down the label chain. A genuine vial names its manufacturer, carries an NDC in three segments with Hospira's labeler code 0409 at the front, states Bacteriostatic Water for Injection USP, names benzyl alcohol 0.9 percent as the preservative, says multiple-dose, and carries a lot number and expiry date matching the carton. The flip-top cap should be intact over an unpunctured stopper. The common problem here is not a fake chemical but a real 30 mL bottle decanted into smaller vials: the water is genuine, but the sterility guarantee is gone and the 28 day clock started on a date you cannot discover. Loose vials with no carton or no lot number should be treated as repackaged.