using a randomized crossover design , 1-g intravenous doses of cephalothin and cefoxitin , a cephalosporinase-resistant cephamycin , were infused into 12 normal adult males over periods of 120 , 30 , and 3 min , the last with and without prior intravenous infusions of probenecid ( 1 g ) .
C0007557
cefoxitin
C0007736
cephamycin