What is the preferred antibiotic for treating a urinary tract infection (UTI) in pregnant women?

Nitrofurantoin is considered the preferred antibiotic for treating uncomplicated urinary tract infections (UTIs) in pregnant women, particularly during the first and second trimesters. This antibiotic is effective against common uropathogens and has a low risk of causing harm to the developing fetus compared to some other options.

Amoxicillin can be used as well, but it may not be as effective against some resistant strains of uropathogens. Metronidazole is generally not the first-line choice for UTIs, as it is primarily used for anaerobic infections and certain protozoal infections. Ciprofloxacin, a fluoroquinolone, is contraindicated during pregnancy due to concerns about potential adverse effects on fetal development, especially regarding the musculoskeletal system.

Using nitrofurantoin allows for effective treatment while ensuring the safety of both the mother and the unborn child, making it the preferred choice in this scenario.