| 1st | cephalothin | cephaloridine | cephapirin | cefazolin | cephacetrile | |
| D-a-aminobenzyl side chain | cephaloglycine | cephalexin | cephradine | cefadroxil | ||
| 2nd | D-a-aminobenzyl west end | cefaclor | cefprozil | D-a-hydroxy benzyl west end | cefamandole | cefonicid |
| cephamycins (B lactamase stable cephalosporins) | cephamycin C | cefoxitin | cefmetazole | cefotetan | ||
| 2-aryl-2-oximino acetamido west end | cefuroxime (parentral) | cefuroxime (orally) | ||||
| 3rd | methoxy imino ,e 4 amino thiazolyl west end | cefotaxime | ceftizoxime | ceftriaxone | acylation of a-amino functionality | cefoperazone |
| imine oxygen substit (anti ps.) | ceftazidime | ceftibuten | cefixime | |||
| 4th | aminothiazolyl (methoxy imino) west end | cefpirome | cefepime | |||
| non classical B lacatams | ||||||
| Monalactam (oxacephem) | Loracarbef (carbacephem) | Mecillinam (6-amidinocillin) | Thienamycin (carbapenem) | |||
| imipenem | sulfazecin (monobactam) | Aztreonam (monobactam) | sulbactam (penicillanic acid) | clavulanic acid (oxapenam /clavam) | ||