Ampicillin Online Treatment And Info
June 4, 2009 – 4:12 am
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Ampicillin for Injection, USP diffuses readily into most body tissues and fluids. However, penetration into the cerebrospinal fluid and brain occurs only when the meninges are inflamed. Ampicillin is excreted largely unchanged in the urine and its excretion can be delayed by concurrent administration of probenecid. The active form appears in the bile in higher concentrations than those found in serum. Ampicillin is the least serum-bound of all the penicillins, averaging about 20% compared to approximately 60 to 90% for other penicillins. Ampicillin for Injection, USP is well tolerated by most patients and has been given in doses of 2 grams daily for many weeks without adverse reactions.
Microbiology
While in vitro studies have demonstrated the susceptibility of most strains of the following organisms, clinical efficacy for infections.
The following bacteria have been shown in in vitro studies to be susceptible to Ampicillin:
GRAM-POSITIVE ORGANISMS: Hemolytic and nonhemolytic streptococci, D. pneumoniae, nonpenicillinase-producing staphylococci, Clostridia spp., B. anthracis, Listeria monocytogenes, and most strains of enterococci.
GRAM-NEGATIVE ORGANISMS: H. influenzae, N. gonorrhoeae, N. meningitidis, Proteus mirabilis, and many strains of Salmonella, Shigella, and E. coli.
Ampicillin does not resist destruction by penicillinase.
Susceptibility Tests
Ampicillin Susceptibility Test Discs, 10 µg, should be used to estimate the in vitro susceptibility of bacteria to Ampicillin.
Indications and Usage for Ampicillin
Ampicillin for Injection, USP is indicated in the treatment of infections caused by susceptible strains of the designated organisms in the following conditions:
Respiratory tract Infections caused by S. pneumoniae (formerly D. pneumoniae). Staphylococcus aureus (penicillinase and nonpenicillinase-producing), H. influenzae, and Group A beta-hemolytic Streptococci.
Bacterial Meningitis caused by E. coli, Group B Streptococci, and other Gram-negative bacteria (Listeria monocytogenes, N. meningitidis). The addition of an aminoglycoside with Ampicillin may increase its effectiveness against Gram-negative bacteria.
Septicemia and Endocarditis caused by susceptible Gram-positive organisms including Streptococcus sp., penicillin G-susceptible staphylococci, and enterococci. Gram-negative sepsis caused by E. coli, Proteus mirabilis and Salmonella sp. respond to Ampicillin. Endocarditis due to enterococcal strains usually respond to intravenous therapy. The addition of an aminoglycoside may enhance the effectiveness of Ampicillin when treating streptoccoccal endocarditis.
Urinary Tract Infections caused by sensitve strains of E. coli and Proteus mirabilis.
Gastrointestinal Infections caused by Salmonella typhosa (typhoid fever), other Salmonella sp., and Shigella sp. (dysentery) usually respond to oral or intravenous therapy.
Bacteriology studies to determine the causative organisms and their susceptibility to Ampicillin should be performed. Therapy may be instituted prior to obtaining results of susceptibility testing.
It is advisable to reserve the parenteral form of this drug for moderately severe and severe infections and for patients who are unable to take the oral forms. A change to oral Ampicillin may be made as soon as appropriate.
To reduce the development of drug-resistant bacteria and maintain the effectiveness of Ampicillin and other antibacterial drugs, Ampicillin should be used only to treat or prevent infections that are proven or strongly suspected to be caused by susceptible bacteria. When culture and susceptibility information are available, they should be considered in selecting or modifying antibacterial therapy. In the absence of such data, local epidemiology and susceptibility patterns may contribute to the empiric selection of therapy.

