gram- dont develop resistence eaisly 1st generation ( cephalexin , cefazolin ) mainly gram+, strepto and staph so important for skin infection can be used to treat some cases of UTI 2nd generation ( cefuroxime , cefoxitin ) more gram- than 1st and also cover gram+ , so mainly used to treat UTI gram- and some gram+ strepto infection like tosillitis otitis media ... cefoxitin also cover anaerobics ( GI flora ) best choice of GI surgery prophylaxis ... 3rd generations (ceftrixone , cefotaxime ceftazidim ) excellent gram- so used to treat UTI encapsulated bacteria such as pnemo ,meningo , Hib cross blood brain barrier so its important for meningitis gonorrhea dont cover staph dont cover anaerobics ceftazidine the only that covers pseudomonas aerogenosa ...
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