four antibiotics proved to be superior in preventing postpartum endometritis : ampicillin 2 gm ( p = 0.03 ) , cefazolin 2 gm ( p = 0.005 ) , piperacillin 4 gm ( p = 0.0007 ) , and cefotetan 1 gm ( p = 0.0001 ) .
C0002680
ampicillin
C0031955
piperacillin