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Linezolid, a synthetic oxazolidinone antimicrobial, shows a wide spectrum against Gram-positive bacteria andmultidrug-resistant bacteria such as anaerobes, methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant enterococci, penicillin-resistant pneumococci and streptococcus [1,2].

Oxazolidinones could inhibit protein synthesis by binding to a site on the bacterial 23S ribosomal RNA of the 50S subunit and prevent the formation of a functional 70S-initiation complex. Linezolid is also a weak, nonselective and reversible inhibitor of monoamine oxidase [2].

In Vitro: Linezolid was a potent inhibitor of cell-free transcription-translation in E. coli. IC50 was 1.8 mM[3]. linezolid MICs vary slightly owing to the different test method and laboratory. The MIC values were between 0.5 and 4 mg/L for streptococci, enterococci and staphylococci [4].

Clinical Trials: Linezolid is fully bioavailable following oral administration, with maximum plasma linezolid concentrations achieved between 1 and 2 hours after oral administration. The elimination half-life of linezolid is 5–7 hours, and twice-daily administration of 400–600mg provides steady-state concentrations in the therapeutic range[5].

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