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Sterile water is water supplied in a sealed container as a sterile, nonpyrogenic product, and the label on the container decides what it may be used for. The same plain water can be labelled “for Injection” (a diluent for pharmacy compounding) or “for Irrigation” (not for injection), and the two are not interchangeable. This page is for clinic staff, buyers and students who need to read those labels correctly.
This page describes products and general use; it is not medical advice.
What sterile water is
Sterile water is chemically H2O. The label of one Sterile Water for Injection USP product describes it as “a sterile, nonpyrogenic water for injection intended only for dilution purposes,” with a pH of 5.4 (range 5.0 to 7.0), containing “no bacteriostat, antimicrobial agent or added buffer.” The label adds that it may be classified as a sterile diluent and pharmaceutical vehicle (ICU Medical label).
A B. Braun product page describes the injection grade as a clear, colorless, odorless liquid that is sterile, hypotonic and nonpyrogenic, with no bacteriostatic or antimicrobial agents (B. Braun USA).
Where it appears: in pharmacy admixture programs (injection grade) and in irrigation containers supplied for use as directed by a prescriber.
Sterile, distilled and nonpyrogenic are separate words on the label
The ICU Medical irrigation label reads “STERILE, DISTILLED, NONPYROGENIC.” Each word is a separate property stated on the container. Sterile and nonpyrogenic appear on both labels compared below; “distilled” appears on the irrigation label. If you are comparing products, compare the printed wording rather than assuming one term implies the others. For the pyrogen term, see what non-pyrogenic means on medical device labels.
How it is packaged
The two labels compared on this page describe flexible plastic containers. The injection pharmacy bulk package is a flexible container made of a specially formulated polyvinylchloride (ICU Medical label). The irrigation label carries the note “CONTAINS DEHP.” A pharmacy bulk package, per the same injection label, is “a sterile dosage form which contains multiple single doses for use only in a pharmacy bulk admixture program.”
Types: for Injection versus for Irrigation
The table sets two real labels side by side. Both are ICU Medical 2000 mL containers; other manufacturers’ labels may word these points differently.
| Label point | Sterile Water for Injection USP (2000 mL pharmacy bulk package) | Sterile Water for Irrigation USP (2000 mL container) |
|---|---|---|
| Stated purpose | “For dilution only”; for use only with automated compounding devices | “For irrigation” |
| Contraindication | “Not for direct infusion”; not for non-automated admixture preparation | “Not for injection” |
| pH | 5.4 (5.0 to 7.0) | 5.5 (5.0 to 7.0) |
| Bacteriostat or antimicrobial | None | None (“contains no bacteriostat”) |
| Hemolysis warning | Solute-free; entry into the circulation undiluted will cause hemolysis | “Not isotonic. Hemolytic.” |
| Heating | Do not heat over 66 °C (150 °F) | Do not heat over 66 °C (150 °F) |
| After opening | The label gives a time limit for discarding the container once the closure has been entered | Single-dose container; discard unused portion |
| Before use | Use only if water is clear, seal intact and container undamaged | Use only if solution is clear and container undamaged |
Sources: ICU Medical Sterile Water for Injection USP 2000 mL pharmacy bulk package label (PDF) and Sterile Water for Irrigation USP 2000 mL label (PDF), both checked 2026-10-30.
Sizes that appear on labels
| Product | Container size on label | Source |
|---|---|---|
| Sterile Water for Injection USP, pharmacy bulk package | 2000 mL flexible container | ICU Medical label |
| Sterile Water for Injection USP, pharmacy bulk package | 3000 mL TITAN XL container, 4 units per case | B. Braun USA product page |
| Sterile Water for Irrigation USP | 2000 mL container with graduations from 250 to 1750 mL | ICU Medical label |
These are examples from the labels cited, not a complete list of sizes on the market.
Reading the label: injection versus irrigation
The labels cited here state different purposes for each product. A pharmacy bulk package is labelled for dilution in an automated compounding setting and “not for direct infusion.” An irrigation container is labelled “for irrigation” and “not for injection.” The labels state no other use. For the saline product that is often confused with it, see what 0.9% sodium chloride is, and for irrigation supplies in general see the wound and surgical irrigation supplies guide.
Label handling statements
- Condition check: the labels say to use the product only if the water or solution is clear and the container is undamaged, and, for the injection pack, the seal is intact.
- Heat limit: both labels state not to heat over 66 °C (150 °F).
- Discard rules differ: the injection pharmacy bulk package label gives a time limit once the closure has been entered, and the irrigation container is single-dose with the unused portion discarded.
- Neither product contains a bacteriostat, which is why the labels carry these discard rules.
Wound-care supplies such as medical bandages are a separate product category from sterile water.
Common mistakes
- Treating the two labels as interchangeable. Irrigation water is labelled “not for injection”; the injection pack is labelled for dilution only.
- Treating the injection pack as a ready-to-use fluid. Its label states “not for direct infusion” and describes it as solute-free.
- Ignoring the heat limit. Both labels state a 66 °C (150 °F) limit.
- Ignoring the discard rule. Each label states how an opened container is to be discarded; neither product contains a bacteriostat.
- Using a damaged or cloudy container. Both labels say not to.
FAQ
What is sterile water?
Sterile water is H2O supplied sterile and nonpyrogenic in a sealed container, with no bacteriostat or added buffer on the labels cited. Its permitted use is whatever the label states, such as dilution or irrigation.
What are the uses of sterile water?
The labels cited on this page state two uses: as a diluent for preparing intravenous admixtures in a pharmacy bulk admixture program (Sterile Water for Injection), and for irrigation (Sterile Water for Irrigation, “not for injection”). The B. Braun page describes the injection grade as a diluent or solvent for other parenteral drugs, suitable for intravascular injection only after it has been made approximately isotonic. Any use beyond what a given label states is outside what these sources cover.
Can sterile water be injected on its own?
No. The injection pack is labelled “not for direct infusion,” and its label warns that undiluted entry into the circulation causes hemolysis.
Sources
- ICU Medical, Sterile Water for Injection USP 2000 mL Pharmacy Bulk Package label, checked 2026-10-30: https://www.icumed.com/media/cb3beetu/qen-4665_0990-7118-07.pdf
- ICU Medical, Sterile Water for Irrigation USP 2000 mL container label, checked 2026-10-30: https://www.icumed.com/media/p54jzlp2/0990-7973-07_label.pdf
- B. Braun USA, Sterile Water for Injection USP 3000 mL product page, checked 2026-10-30: https://www.bbraunusa.com/en/products/b2/sterile-water-forinjectionusp3000ml.html
