the new penicillins show synergistic activity in combination with aminoglycosides but , when combined with other beta-lactams , may be synergistic ( piperacillin and moxalactam ; mezlocillin and cefoperazone ) , indifferent , or antagonistic ( azlocillin , mezlocillin , or piperacillin and cefoxitin or cefamandole ) .
C0030842
penicillins
C0282215
beta-lactams