LORACARBEF IS A SYNTHETIC ?-LACTAM ANTIBIOTIC OF THE CARBACEPHEM CLASS FOR ORAL ADMINISTRATION. CHEMICALLY, CARBACEPHEMS DIFFER FROM CEPHALOSPORIN-CLASS ANTIBIOTICS. LORACARBEF EXERTS ITS BACTERICIDAL ACTION BY BINDING TO ESSENTIAL TARGET PROTEINS OF THE BACTERIAL CELL WALL, LEADING TO INHIBITION OF CELL-WALL SYNTHESIS. IT IS STABLE IN THE PRESENCE OF SOME BACTERIAL ?-LACTAMASES.