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  • Title: Carfecillin: antibacterial activity in vitro and in vivo.
    Author: Basker MJ, Comber KR, Sutherland R, Valler GH.
    Journal: Chemotherapy; 1977; 23(6):424-35. PubMed ID: 21771.
    Abstract:
    Carfecillin, the alpha-phenyl ester of carbenicillin, hydrolyses rapidly in the presence of serum or body tissues to liberate carbenicillin but hydrolysis is less rapid in aqueous solution. The activity of carfecillin in antibacterial tests in vitro depends upon the extent of hydrolysis to carbenicillin, and in conventional serial dilution tests carfecillin shows an antibacterial spectrum generally similar to that of carbenicillin due to extensive hydrolysis. However, in tests in which the extent of hydrolysis is reduced, carfecillin displays lesser activity than carbenicillin against gram-negative bacilli and greater activity against gram-positive cocci. In the presence of serum carfecillin is hydrolysed rapidly to carbenicillin and the activity shown is solely that of carbenicillin. Unlike carbenicillin, carfecillin is well absorbed in mice after oral administration, producing significant carbenicillin blood concentrations and the compound is as effective by the oral route in the treatment of various experimental mouse infections as is parenteral carbenicillin.
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