After a single infusion of 500 mg , 1 000 mg and 2 000 mg of injectable cefetamet sodium , peak concentration of the drug at 0.5 h reached ( 37.92 + / - 7.43 ) , ( 74.90 + / - 10.67 ) and ( 148.54 + / - 31.63 ) mg/L , with areas under concentration-time curve of ( 72.08 + / - 14.98 ) , ( 144.28 + / - 24.57 ) and ( 286.66 + / - 54.25 ) ( mg x h ) / L , respectively .