Nitrofurantoin is best used for which type of infection?

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Nitrofurantoin works best for infections confined to the lower urinary tract because it concentrates in urine and achieves high local activity there, making it highly effective for uncomplicated cystitis caused by common urinary pathogens. Its limited penetration into renal, prostatic, or systemic tissues means it isn’t reliable for infections like pyelonephritis or prostatitis, where treatment needs good tissue penetration and systemic effect. It’s also not ideal for hospital-acquired UTIs, which often involve more resistant organisms and may require broad-spectrum or IV therapy. Therefore, its strongest role is in uncomplicated lower UTIs, where bladder flora are addressed without needing drug distribution to other tissues.