All true about cephalosporins EXCEPT:
This 2nd generation cephalosporin was developed subsequent to the first generation compounds and are more active against gram-negative organisms, anaerobes, but none inhibits P. aeruginosa ESSENTISLS OF MEDICAL PHARMACOLOGY
Ceftazimide is a 3rd generation cephalosporin
Cefoperzone has got antipseudomonal effect.
Cefoxitin has got no activity against anaerobes
Cephalosporins act by inhibiting cell wall synthesis
Chemotherapy