No. Sodium chloride and bacteriostatic water are not the same thing. Sodium chloride 0.9% (normal saline) is sterile salt water containing 0.9% sodium chloride. It is commonly used for dilution or reconstitution of certain medications when specifically indicated. Bacteriostatic water is sterile water that contains a small amount of benzyl alcohol, which helps inhibit bacterial growth after the vial is entered multiple times. They should not automatically be substituted for one another. The appropriate diluent depends on the specific medication and its manufacturer’s instructions. Using the wrong diluent can affect the medication’s stability, concentration, or safety. If your prescription specifically calls for bacteriostatic water, I would use bacteriostatic water rather than substituting normal saline unless the prescribing clinician or pharmacy has specifically confirmed that saline is appropriate.