because the insensitivity of bacteroides fragilis to penicillins is due to betalactamase formation , the potentiating effect of the betalactamase inhibitor clavulanic acid on the action of amoxycillin and benzylpenicillin against this bacterium was studied in vitro and in an experimental infection in mice .
C0030842
penicillins
C0030827
benzylpenicillin