After a single infusion of @ mg , @ @ mg and @ @ mg of injectable cefetamet sodium , peak concentration of the drug at @ h reached ( @ + / - @ ) , ( @ + / - @ ) and ( @ + / - @ ) mg/L , with areas under concentration-time curve of ( @ + / - @ ) , ( @ + / - @ ) and ( @ + / - @ ) ( mg x h ) / L , respectively .