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  • Title: Amdinocillin: interaction with other beta-lactam antibiotics for gram-negative bacteria.
    Author: Eng RH, Liu R, Smith SM, Johnson ES, Cherubin CE.
    Journal: Chemotherapy; 1988; 34(1):18-26. PubMed ID: 3258230.
    Abstract:
    Amdinocillin was studied alone and in combination with three other beta-lactam antibiotics (aztreonam, cefoperazone, and ceftriaxone) for activity against gram-negative bacilli. These antibiotic combinations failed to show synergy by the checker-board double-dilution test or by killing kinetic studies. However, amdinocillin did show additive killing action when combined with the other beta-lactam antibiotics studied. Amdinocillin failed to induce or inhibit beta-lactamase production in species of Enterobacteriaceae, but with Pseudomonas aeruginosa, beta-lactamase production was induced. It is concluded that the activity of amdinocillin alone or in combination with another beta-lactam antibiotic should not be more effective in the treatment of infections by gram-negative bacilli than just using the beta-lactam antibiotic alone at a higher dose.
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