A 28-year-old woman from Delhi presents to the emergency department with acute onset dysuria, frequency, and suprapubic pain for 2 days. She denies fever, flank pain, or vaginal discharge. Urinalysis shows pyuria (>5 WBC/hpf), bacteriuria, and nitrites. Urine culture is pending. Blood pressure is 110/70 mmHg, temperature 37.2°C. She has no known drug allergies. Which of the following is the most appropriate empiric antibiotic choice for uncomplicated acute cystitis in this patient?

Explanation

## Clinical Presentation This patient has uncomplicated acute cystitis (lower UTI) with classic symptoms: dysuria, frequency, suprapubic pain, and pyuria/bacteriuria on urinalysis. She is hemodynamically stable, afebrile, and has no signs of pyelonephritis (no fever, flank pain, or systemic toxicity). ## Antibiotic Selection for Uncomplicated Cystitis **Key Point:** Uncomplicated acute cystitis in non-pregnant women is treated with short-course oral antibiotics targeting common uropathogens (E. coli, Klebsiella, Proteus). **High-Yield:** Nitrofurantoin is the preferred first-line agent for uncomplicated cystitis because: - Achieves high urinary concentrations - Minimal systemic absorption → low collateral damage to gut flora - Low resistance rates in E. coli (typically <5% in community settings) - Short course (5–7 days) is effective - Excellent safety profile in non-pregnant women **Clinical Pearl:** Nitrofurantoin should NOT be used in pyelonephritis (inadequate tissue penetration) or in patients with eGFR <30 mL/min (accumulation risk). ## Why Other Options Are Suboptimal | Agent | Role | Limitation for This Case | |-------|------|---------------------------| | Ceftriaxone IV | Complicated UTI, pyelonephritis, sepsis | Overkill for uncomplicated cystitis; requires IV access; promotes resistance | | Fluoroquinolone | Second-line or pyelonephritis | Overuse drives resistance; reserve for complicated cases or allergy | | Amoxicillin-clavulanate | Broader spectrum | Higher rates of E. coli resistance; not preferred for UTI; longer course | **Warning:** Fluoroquinolones are increasingly restricted in uncomplicated UTI due to rising resistance and risk of serious adverse effects (tendinopathy, QT prolongation, C. difficile). ## Mnemonic: **NUFF** for Nitrofurantoin in Uncomplicated Cystitis - **N**itrofurantoin first-line - **U**ncomplicated lower UTI - **F**ew side effects, fast clearance - **F**ew resistance patterns [cite:Harrison 21e Ch 304]