IT IS A COMBINATION OF SULFONAMIDES EXHIBITING MAXIMUM SYNERGISM (TRIMETHOPRIM 80 MG WITH SULFAMETHOXAZOLE 400 MG). ADDITIONAL ORGANISMS COVERED BY THE COMBINATION ARE SALMONLLA TYPHI, SERRATIA, KLEBSIELLA, YERSINIA ENTEROCOLITICA, PNEUMOCYSTIS CARINII AND MANY SULFONAMIDE RESISTANT STRAINS OF STAPH AUREUS, STREP. PYOGENES, GHIGELLA, ENTER PATHOGENIC E.COLI, H. INFLUENZAE AND GONOCOCCI.