Bacteriostatic Water for Injection (BWFI) is sterile water containing a small amount of benzyl alcohol as a preservative. It is used in healthcare settings as a diluent for certain injectable drugs when the medication’s labeling specifically permits its use.

Bacteriostatic Water for Injection

is a sterile preparation containing water for injection and a preservative, typically 0.9% benzyl alcohol. It is intended as a diluent or solvent for medications that are labeled for reconstitution with bacteriostatic water. The appropriate diluent depends on the specific medication and its manufacturer instructions.

Important: Bacteriostatic water is not interchangeable with sterile water for injection for every application. It should only be used according to the labeling and instructions provided by the medication manufacturer or a qualified healthcare professional. Benzyl alcohol also presents particular safety concerns in neonates and certain other populations.

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FAQ

What is bacteriostatic water?

Bacteriostatic Water for Injection (BWFI) is sterile water containing a preservative, typically 0.9% benzyl alcohol, that helps inhibit the growth of microorganisms.

What is bacteriostatic water used for?

It is used as a diluent for certain injectable medications when the medication’s prescribing information specifically permits bacteriostatic water.

Is bacteriostatic water the same as sterile water?

No. Bacteriostatic Water for Injection contains a preservative, while Sterile Water for Injection does not. They should not automatically be substituted for one another.

Does bacteriostatic water contain benzyl alcohol?

Yes. Standard BWFI contains 0.9% benzyl alcohol as a preservative. Always check the product label for the exact formulation.

Can bacteriostatic water be used with any medication?

No. The appropriate diluent depends on the medication. Always follow the medication manufacturer’s instructions or advice from a qualified healthcare professional.

How should bacteriostatic water be stored?

Storage requirements vary by manufacturer. Follow the product label and package insert for the appropriate storage conditions and handling instructions.

How long does bacteriostatic water last after opening?

The commonly cited 28-day period applies to some multi-dose products, but you should follow the specific manufacturer’s labeling rather than assuming this applies to every product.

Is bacteriostatic water safe?

It is an approved pharmaceutical diluent for appropriate uses when handled correctly. However, benzyl alcohol can be harmful to certain populations, particularly neonates, so the product should only be used as directed.

Can bacteriostatic water be used by itself?

Bacteriostatic water is generally intended as a diluent/solvent, not as a medication or treatment by itself.

What is the difference between bacteriostatic water and normal saline?

Bacteriostatic water is water for injection containing a preservative, while saline contains sodium chloride in water. They have different formulations and aren’t automatically interchangeable.

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