Substituted sulfonylacetamido cephalosporins

A pharmaceutical composition comprising an antibacterially effective amount of a compound of the formula ##SPC2##

• where:
• X is lower alkyl of C.sub.1 -C.sub.6 ;
• A is CH.sub.2 S-Het;
• Het is a 5- or 6-membered heterocyclic ring containing one to four atoms selected from the group consisting of N, O and S, unsubstituted or substituted with from one to two groups selected from the group consisting of lower alkyl, cycloalkyl or alkenyl, each having one to four carbon atoms;
• lower alkoxy or alkoxyalkyl, each alkyl or alkoxy having one to four carbon atoms;
• hydroxy;
• CF.sub.3 ;
• NHR;
• NR.sub.2 ;
• SR;
• or halogen;
• R is hydrogen or alkyl (C.sub.1 -C.sub.4);
• and
• M is hydrogen, alkali metal cation or nontoxic ammonium cation
• and a pharmaceutically acceptable carrier therefor.