Bicillin C-R 900 300
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Bicillin C-R 900/300
CLINICAL PHARMACOLOGY
General
Penicillin G benzathine and penicillin G procaine have a low solu-bility and, thus, the drugs are slowly released from intramuscular injection sites. The drugs are hydrolyzed to penicillin G. This combination of hydrolysis and slow absorption results in blood serum levels much lower but more prolonged than other parenteral penicillins. Intramuscular administration of 1, 200, 000 units of Bicillin C-R 900/300 (penicillin g benzathine and penicillin g procaine injection) in patients weighing 100 to 140 lbs. usually produces average blood levels of 0. 24 units/mL at 24 hours, 0.039 units/mL at 7 days, and 0. 024 units/mL at 10 days.
Approximately 60% of penicillin G is bound to serum protein. The drug is distributed throughout the body tissues in widely varying amounts. Highest levels are found in the kidneys with lesser amounts in the liver, skin, and intestines. Penicillin G penetrates into all other tissues and the spinal fluid to a lesser degree. With normal kidney function, the drug is excreted rapidly by tubular excretion. In neonates and young infants and in individuals with impaired kidney function, excretion is considerably delayed.
Microbiology
Penicillin G exerts a bactericidal action against penicillin-susceptible microorganisms during the stage of active multiplication. It acts through the inhibition of biosynthesis of cell-wall mucopep-tide. It is not active against the penicillinase-producing bacteria, which include many strains of staphylococci.
The following in vitro data are available, but their clinical significance is unknown. Penicillin G exerts high in vitro activity against staphylococci (except penicillinase-producing strains), streptococci (Groups A, C, G, H, L, and M), and pneumococci. Other organisms susceptible to penicillin G are Neisseria gonorrhoeae, Corynebacterium diphtheriae, Bacillus anthracis, Clostridia species, Actinomyces bovis, Streptobacillus moniliformis, Listeria monocytogenes, and Leptospira species. Treponema pallidum is extremely susceptible to the bactericidal action of penicillin G. Susceptibility Test: If the Kirby-Bauer method of disc susceptibility is used, a 10-unit penicillin disc should give a zone greater than 28 mm when tested against a penicillin-susceptible bacterial strain.
Last reviewed on RxList: 2/20/2009
This monograph has been modified to include the generic and brand name in many instances.
Additional Bicillin C-R 900/300 Information
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