Which cephalosporin combination is listed as a first-line option for UTIs?

• A. Cephalexin/cefazolin
• B. Cefdinir
• C. Ceftriaxone
• D. Cefotaxime

Answer: (A)

The key idea is choosing a cephalosporin with reliable activity against the common urinary pathogens and good urinary penetration, in a form that fits the setting of the infection. Cephalexin, an oral first-generation cephalosporin, is well-suited for uncomplicated UTIs treated in the outpatient setting because it covers the typical bacteria like E. coli and reaches effective levels in the urine. Cefazolin, its IV counterpart, serves the same purpose for inpatients or more severe cases where IV therapy is needed. This makes cephalexin or cefazolin the appropriate cephalosporin options for first-line UTI treatment.

Cefdinir is a third-generation oral cephalosporin, which is broader in spectrum but is not considered a first-line choice for uncomplicated UTIs due to factors like resistance patterns and pharmacodynamics in the urine. Ceftriaxone and cefotaxime are parenteral agents used for more severe or complicated infections or when IV therapy is required, not for routine first-line treatment of uncomplicated UTIs.