Ceftriaxone interferes with the biosynthesis of the peptidoglycan component of the bacterial cell way by binding to and inactivating penicllin-binding proteins (PBPs). Tazobactam is a penicillanic acid sulfone derivative with -lactamase inhibitory properties. It enhances the activity of -lactam antibacterials against -lactamase-producing bacteria.
Distribution
Ceftriaxone: 98% bound to plasma proteins; crosses the blood brain barrier. Tazobactam: About 30% bound to plasma proteins; widely distributed to tissues and body fluids.
Excretion
Ceftriaxone: Elimination half-life is about 8.7 hours; 33-67% removed as unchanged drug. Tazobactam: Removed mainly via kidneys with 80% of an administered dose as unchanged drug.
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