Sterile water containing a small amount of benzyl alcohol, FDA-regulated as a multi-dose diluent for pharmaceutical and laboratory reconstitution.
Bacteriostatic water is sterile water containing 0.9% benzyl alcohol, which acts as a preservative that inhibits bacterial growth. This allows it to be used as a multi-dose diluent, unlike standard sterile water which must be used once and discarded.
Bacteriostatic water is FDA-regulated as a pharmaceutical diluent. It is used for reconstituting research compounds and requires careful handling; it should not be used for reconstituting products intended for newborns due to the benzyl alcohol content.