Sterile Water for Injection
Also known as: Sterile water · Water for injection · WFI
A preservative-free sterile water used as a single-use diluent; it is a solvent, not a therapeutic.
Sterile Water for Injection at a glance
| Name | Sterile Water for Injection |
|---|---|
| Also known as | Sterile water, Water for injection, WFI |
| Category | Solvents & reconstitution |
| Type | Amino / injectable |
| Sequence | Sterile water for injection with no added preservative. |
| Typical dose | No therapeutic dose - volume chosen to reach a desired concentration |
| Frequency | Not applicable |
| Route | Diluent (mixed into a powder vial) |
| Half-life | Not applicable - it is a solvent, not an active compound. |
Overview
Sterile water for injection is purified, sterilized water containing no antimicrobial preservative. Because it has nothing to inhibit bacterial growth, it is intended for single use and is often chosen where benzyl alcohol must be avoided.
How it’s thought to work
- Serves as the liquid vehicle that dissolves a lyophilized powder.
- Contains no preservative, so an opened vial is meant for immediate single use.
- Used where preservatives such as benzyl alcohol are contraindicated.
- Has no pharmacological action of its own on the target condition.
Researched uses
- Single-use reconstitution of injectable powders
- Preparations where preservative-free diluent is required
- Neonatal and preservative-sensitive contexts
- General laboratory dilution
Commonly cited protocol
| Typical dose | No therapeutic dose - volume chosen to reach a desired concentration |
|---|---|
| Frequency | Not applicable |
| Route | Diluent (mixed into a powder vial) |
| Notes | Being preservative-free, discard leftover after a single use. |
Reconstitution
This item is itself the diluent. The added volume sets the final concentration of the dissolved powder. Because it lacks a preservative, it is intended for single use rather than repeated multi-dose entry.
Cautions
- A medical solvent, not a therapeutic agent.
- No preservative, so any remainder should be discarded after single use.
- Not for direct injection undiluted in ways that are hypotonic; used to reconstitute or dilute.
- Educational information only, not medical advice.
Sterile Water for Injection FAQ
What is Sterile Water for Injection?
A preservative-free sterile water used as a single-use diluent; it is a solvent, not a therapeutic.
How does Sterile Water for Injection work?
Serves as the liquid vehicle that dissolves a lyophilized powder. Contains no preservative, so an opened vial is meant for immediate single use. Used where preservatives such as benzyl alcohol are contraindicated. Has no pharmacological action of its own on the target condition.
What is Sterile Water for Injection used for?
Single-use reconstitution of injectable powders; Preparations where preservative-free diluent is required; Neonatal and preservative-sensitive contexts; General laboratory dilution.
What is a typical Sterile Water for Injection dose?
No therapeutic dose - volume chosen to reach a desired concentration, Not applicable, Diluent (mixed into a powder vial). This is a commonly cited figure for context only, not medical advice.
How do you reconstitute Sterile Water for Injection?
This item is itself the diluent. The added volume sets the final concentration of the dissolved powder. Because it lacks a preservative, it is intended for single use rather than repeated multi-dose entry.
What is the half-life of Sterile Water for Injection?
Not applicable - it is a solvent, not an active compound.