Cellulitis not responding to cephalexin. People with mild cellulitis may take . unless a person is seriously ill or the infection is not responding . . . . . . . . . Augmentin is an antibiotic which is often used when a physician is concerned about bacteria with a drug resistance to cephalexin. . . antibiotic to ensure that the infection is responding . . . . . infections not responding to oral antibiotics: Third . lesions present or not responding to . . . . An example is cephalexin (Keflex).... more