Each milliliter contains sodium chloride 9mg and 0.9% benzyl alcohol added as a bacteriostatic preservative that allows you to reuse repeated withdrawals for up to 28 days. Bacteriostatic Sodium Chloride (normal saline) for Injection 20ml by Pfizer Injectables {formally Hospira Worldwide}. Bacteriostatic Sodium Chloride is a sterile, multiple-dose sodium chloride in water for injection!.