Which antibiotic is first-line for uncomplicated cystitis?

Which antibiotic is first-line for uncomplicated cystitis?

• A. Ciprofloxacin
• B. Trimethoprim-sulfamethoxazole (Bactrim)
• C. Nitrofurantoin (Macrobid)
• D. Amoxicillin

Answer: (C)

Uncomplicated cystitis is a bladder infection in a healthy, nonpregnant person, so the antibiotic choice should target the bladder with minimal systemic effects. Nitrofurantoin fits this well because it concentrates in urine and is highly active against the common bladder pathogens such as E. coli, while having relatively low resistance rates. Its action is localized to the lower urinary tract, which makes it effective for simple cystitis and helps limit impact on microbial flora elsewhere. Because of these properties, it’s preferred as a first-line option. In contrast, antibiotics like ciprofloxacin carry a higher risk of systemic side effects and contribute more to antimicrobial resistance, so they’re reserved for complicated infections or when others aren’t suitable. Trimethoprim-sulfamethoxazole can be an alternative if local resistance is low and there’s no sulfa allergy, but rising resistance makes it a less universally reliable first choice. Amoxicillin generally isn’t used for uncomplicated cystitis due to high resistance among urinary pathogens. Typical course with nitrofurantoin is about five days.

Uncomplicated cystitis is a bladder infection in a healthy, nonpregnant person, so the antibiotic choice should target the bladder with minimal systemic effects. Nitrofurantoin fits this well because it concentrates in urine and is highly active against the common bladder pathogens such as E. coli, while having relatively low resistance rates. Its action is localized to the lower urinary tract, which makes it effective for simple cystitis and helps limit impact on microbial flora elsewhere. Because of these properties, it’s preferred as a first-line option. In contrast, antibiotics like ciprofloxacin carry a higher risk of systemic side effects and contribute more to antimicrobial resistance, so they’re reserved for complicated infections or when others aren’t suitable. Trimethoprim-sulfamethoxazole can be an alternative if local resistance is low and there’s no sulfa allergy, but rising resistance makes it a less universally reliable first choice. Amoxicillin generally isn’t used for uncomplicated cystitis due to high resistance among urinary pathogens. Typical course with nitrofurantoin is about five days.