Bacteriostatic Water for Injection, USP is a sterile, non-pyrogenic, sterile water that contains 0.9% benzyl alcohol (9mg/mL) added as a bacteriostatic preservative. Bacteriostatic water can be used multiple times up to 28 days once opened. Pfizer recommends that after this time you must discard the vial.This preparation of sterile water and benzyl alcohol (BnOH) allows repeated withdrawals to be made from a single 30mL vial. Hospira Worldwide now Pfizer injectables is the world’s leading manufacturer of bacteriostatic water, Pfizer injectables recommends that once the vial of bacteriostatic water is open the preservatives will prolong its life for up to 28 days and that after this period of time the vial should to be discarded.
A bacteriostatic agent or bacteriostat is a biological or chemical agent that stops bacteria from reproducing, while not necessarily killing them otherwise. Depending on their application, bacteriostatic antibiotics, disinfectants, antiseptics and preservatives can be distinguished. When bacteriostatic antimicrobials are used, the duration of therapy must be sufficient to allow host defense mechanisms to eradicate the bacteria. Upon removal of the bacteriostat, the bacteria usually start to grow again. This is in contrast to bactericides, which kill bacteria.
Bacteriostatic water is a great product for any researcher. Unlike normal, sterile water, bacteriostatic water can be used multiple times in a 28-day period. Regular sterile water is single use and must be discarded after opening.
Many scientists use bacteriostatic water in their experiments. This type of water for injection is a non-pyrogenic water that contains 0.9% benzyl alcohol, which acts as a bacteriostatic agent. This makes it so bacteria cannot grow, which is why it can be used over and over again throughout a month.