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Antibiotic Classification and Modes of Action - bioMerieux

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Customer Education <strong>Antibiotic</strong> <strong>Classification</strong><br />

Beta-lactams International Common Name<br />

Monobactams<br />

Penems<br />

1. Inhibitors <strong>of</strong> Cell Wall Synthesis<br />

Carbapenems<br />

Penems<br />

Inhibitors <strong>of</strong> Cell Wall Synthesis<br />

Beta-lactams: Monobactams<br />

Aztreonam<br />

Imipenem<br />

Meropenem<br />

Ertapenem<br />

Doripenem<br />

Faropenem<br />

Spectrum <strong>of</strong> <strong>Action</strong><br />

• Aztreonam: Gram-negatives (Enterobacteriaceae <strong>and</strong><br />

Pseudomonas). Not hydrolyzed by most commonly occurring<br />

plasmid <strong>and</strong> chromosomally mediated ß-lactamases, <strong>and</strong> does not<br />

induce the production <strong>of</strong> these enzymes.<br />

Beta-lactams: Penems<br />

Slightly different structure than the other ß-lactams, make the Penems<br />

much more resistant to beta-lactamase hydrolysis.<br />

Spectrum <strong>of</strong> <strong>Action</strong><br />

• Carbapenems: ß-lactams with a broad spectrum <strong>of</strong> action. Grampositives,<br />

except MRSA. Gram-negatives, Ps. aeruginosa (except<br />

Ertapenem) <strong>and</strong> anaerobes. Very efficient against high level<br />

cephalosporinase <strong>and</strong> ESBL. Wide diffusion in the body, especially<br />

in the cerebrospinal fluid.<br />

Doripenem (new) - Broad spectrum. Particularly good for<br />

Pseudomonas <strong>and</strong> other non-fermenters.<br />

• Penem: Oral. Primarily for respiratory tract infections. Poor activity<br />

with Serratia, Pseudomonas, Stenotrophomonas.<br />

Faropenem not yet FDA approved.<br />

© bioMérieux, Inc., Customer Education<br />

March 2008<br />

25

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