## Drug of Choice for Uncomplicated Acute Cystitis ### Nitrofurantoin as First-Line Agent **Key Point:** Nitrofurantoin is the preferred first-line agent for uncomplicated acute cystitis (acute uncomplicated urinary tract infection) in non-pregnant, non-renal-impairment patients. **High-Yield:** Nitrofurantoin achieves high urinary concentrations while maintaining low systemic levels, making it ideal for lower UTI without risk of systemic toxicity. ### Why Nitrofurantoin? | Feature | Nitrofurantoin | Fluoroquinolone | Cephalosporin | Amoxicillin-clavulanate | | --- | --- | --- | --- | --- | | **First-line for uncomplicated cystitis** | ✓ Yes | No (reserved) | No (reserved) | No (reserved) | | **Urinary concentration** | Excellent | Good | Good | Moderate | | **Systemic levels** | Minimal | High | High | High | | **Resistance concern** | Low | Increasing | Increasing | Increasing | | **Adverse effects** | Pulmonary (rare), GI | Tendinopathy, QT | Diarrhea, C. diff | Diarrhea, allergy | | **Duration** | 5–7 days | 3 days | 3–5 days | 7 days | **Clinical Pearl:** Fluoroquinolones and cephalosporins are reserved for complicated UTI, pyelonephritis, or resistance patterns — not for simple cystitis, to preserve their utility against resistant gram-negatives and reduce collateral damage to the microbiome. **Mnemonic:** **NUFF** — **N**itrofurantoin for **U**ncomplicated **F**emale cystitis (non-pregnant, **F**irst-line). ### Contraindications to Nitrofurantoin - Pregnancy (especially near term; risk of hemolytic anemia in G6PD-deficient neonates) - Renal impairment (eGFR < 30 mL/min; inadequate urinary concentration) - Pulmonary disease (risk of nitrofurantoin-induced pneumonitis) **Warning:** Do NOT confuse nitrofurantoin with trimethoprim-sulfamethoxazole (TMP-SMX), which was historically used but is now second-line due to rising resistance in E. coli (>20% in many regions).
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