efixime is a semisynthetic, third generation cephalosporin antibiotic, effective against a wide spectrum of sensitive Gram positive, Gram negative and anaerobic bacterial pathogens including beta-lactamase producing strains. It has high affinity for penicillin binding proteins with varying site of activity. It acts by inhibition of bacterial cell-wall synthesis. The elimination half-life is about 3 hours, with little variation over the usual therapeutic dosage range.
Clavulanic acid is a naturally derived beta lactamase inhibitor produced by Streptomyces clavuligerus. Clavulanic acid is an irreversible inhibitor of intracellular and extracellular -lactamases, demonstrating concentration-dependent and competitive inhibition.