Pharmacology Extended-spectrum beta-lactamases (ESBLs) are characterized by activity against all except : A Penicillinases B Cephalosporinases C Oxyimino–cephalosporinases D Carbapenems 💡 Explanation Extended-spectrum beta-lactamases (ESBLs) are characterized by activity against all except : ✓ Correct Answer: D. Carbapenems