Pharmaceutical compositions of .alpha.-amino-.alpha.-(ureidophenyl)acetamidocephalosporins

A pharmaceutical composition comprising a pharmaceutically acceptable carrier and an antibacterial effective amount of a compound of the formula ##STR3## wherein:

• the (R).sub.2 NCXNR group is at the para or meta position;
• R is hydrogen or lower alkyl of 1-4 carbon atoms;
• X is oxygen or sulfur;
• A is SHet;
• and
• Het is tetrazolyl, triazolyl, thiadiazolyl, oxadiazolyl, diazolyl, pyridyl, pyrimidyl or pyrazinyl, unsubstituted or substituted with one or two substituents selected from the group consisting of C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 alkoxy, allyloxy, oxide, halogen, carboxamido, carboxyl, carbalkoxy of C.sub.1 -C.sub.6, mercapto, methylthio, trifluoromethyl, hydroxy, amino, alkylamino, dialkylamino, each undefined alkyl having 1-6 carbon atoms
• or a non-toxic pharmaceutically acceptable salt thereof.