A bacteriostatic agent or bacteriostat, abbreviated Bstatic, is a biological or chemical agent that stops bacteria from reproducing, while not necessarily harming them otherwise. Depending on their application, bacteriostatic antibiotics, disinfectants, antiseptics and preservatives can be distinguished. Upon removal of the bacteriostat, the bacteria usually start to grow again. This is in contrast to bactericides, which kill bacteria.
Bacteriostats are often used in plastics to prevent growth of bacteria on surfaces. Bacteriostats commonly used in laboratory work include sodium azide (which is acutely toxic) and thiomersal (which is a mutagen in mammalian cells).
Bacteriostatic antibiotics 
Bacteriostatic antibiotics limit the growth of bacteria by interfering with bacterial protein production, DNA replication, or other aspects of bacterial cellular metabolism. They must work together with the immune system to remove the microorganisms from the body. However, there is not always a precise distinction between them and bactericidal antibiotics; high concentrations of some bacteriostatic agents are also bactericidal, whereas low concentrations of some bacteriocidal agents are bacteriostatic.
This group includes
See also 
- Pankey GA, Sabath LD (March 2004). "Clinical relevance of bacteriostatic versus bactericidal mechanisms of action in the treatment of Gram-positive bacterial infections". Clin. Infect. Dis. 38 (6): 864–70. doi:10.1086/381972. PMID 14999632.
- Shetty N, Aarons E, Andrews J (2009). "Chapter 5: General principles of antimicrobial therapy". In Andrews J, Shetty N, Tang JW. Infectious Disease: Pathogenesis, Prevention and Case Studies. Wiley-Blackwell. ISBN 1-4051-3543-3.
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