an  inhibitor  of bacterial   beta-lactamase ; pipperacillin; piperacillin/tazobactam; oxacillin; penicillin.  doxycycline , minocycline (has a broader spectrum than the other members of the group). aerobic  and  anaerobic Gram positive  as well as  Gram negative   bacteria ;  i mipenem/cilastatin - is a broad spectrum  beta-lactam   antibiotic  containing equal quantities