Pharmacology General c0245cda All are true about cephalosporins, EXCEPT : A Ceftazidime is a 3rd generation cephalosporin. B Cefoperazone has got antipseudomonal effect. C Cefoxitin has got no activity against anaerobes. D Cephalosporins act by inhibiting cell wall synthesis. High-Yield Explanation β-lactam antibiotics act by inhibiting cell wall synthesis. These include penicillins, cephalosporins, carbapenems and monobactam.