Uti treatment
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UTI Treatment
Overview
A UTI is classified as uncomplicated (healthy, non-pregnant woman, no structural/functional abnormality) or complicated (male, pregnancy, catheter, obstruction, immunocompromise, renal impairment, hospital-acquired). Treatment differs significantly between these categories.
1. Acute Uncomplicated Cystitis (Lower UTI)
These are the first-line oral agents per IDSA guidelines:
| Antimicrobial | Dose (Oral) | Duration | Notes |
|---|---|---|---|
| Nitrofurantoin (macrocrystalline) | 100 mg BID | 5 days | Preferred; low resistance; inactive against Proteus, Pseudomonas; avoid if CrCl < 30 |
| Trimethoprim-sulfamethoxazole (TMP-SMX) | 160/800 mg BID | 3 days | Use only if local resistance < 20% |
| Fosfomycin | 3 g single dose | 1 day | Convenient; effective vs. ESBL producers; reserve to avoid resistance |
Fluoroquinolones (ciprofloxacin, levofloxacin) should NOT be first-line for uncomplicated cystitis due to adverse effects (tendinopathy, C. diff, CNS effects) and increasing resistance. Reserve them for failed first-line therapy or contraindications. - Rosen's Emergency Medicine, p. 1392
Adjunct: Phenazopyridine (Pyridium) can be added for symptomatic dysuria relief - it provides topical urinary analgesia. Warn patients urine will turn orange (can stain contact lenses). - Rosen's Emergency Medicine
2. Uncomplicated Pyelonephritis (Upper UTI)
For outpatient management (patient can tolerate oral intake, no sepsis):
- Ciprofloxacin 500 mg BID x 7 days - preferred where fluoroquinolone resistance < 10%
- TMP-SMX 160/800 mg BID x 10-14 days - alternative
- If fluoroquinolone resistance > 10% in the area: give one dose of IV ceftriaxone 1 g, then transition to oral cephalosporin x 10-14 days
Note: Nitrofurantoin and fosfomycin do NOT achieve adequate blood/tissue levels - they are ineffective for pyelonephritis.
For inpatient (IV) management (sepsis, vomiting, severe illness):
- Ceftriaxone, cefepime, piperacillin-tazobactam, aztreonam, or a fluoroquinolone IV
- Transition to oral antibiotics once clinically improved (typically after 24-48 hours afebrile)
- Total duration: 7-14 days - Rosen's Emergency Medicine, p. 1393
3. Complicated UTI / Pseudomonas Infections
For P. aeruginosa or complicated UTIs: - Goldman-Cecil Medicine
- Duration: 7-10 days (up to 2 weeks for severe pyelonephritis)
- Drug options:
- Quinolones: ciprofloxacin 400 mg IV q8-12h or levofloxacin 750 mg IV daily
- Aminoglycosides: amikacin 15 mg/kg/24h
- Antipseudomonal beta-lactams: piperacillin-tazobactam 4.5 g q8h
- Carbapenems: doripenem 500 mg IV q8h x 10 days
- For difficult-to-treat (DTR) P. aeruginosa: ceftazidime-avibactam, ceftolozane-tazobactam, imipenem-cilastatin-relebactam, or cefiderocol
- Renal/perirenal abscesses ≥ 3 cm: require drainage + 4-6 weeks antibiotics
4. UTI in Pregnancy
- Treat even asymptomatic bacteriuria (up to 30% progress to pyelonephritis if untreated; risk of preterm birth)
- Duration: 7-10 days
- Safe options:
- Cephalexin 500 mg BID x 3-7 days
- Nitrofurantoin 100 mg BID x 3-7 days (avoid near term/3rd trimester)
- Amoxicillin 500 mg TID x 7 days
- TMP-SMX 800/160 mg BID x 3 days (avoid 3rd trimester)
- Pyelonephritis in pregnancy: usually requires IV antibiotics + hospital admission; ceftriaxone IV is preferred (ampicillin resistance in E. coli is high)
- Screen all pregnant women with urine culture at 12-16 weeks (USPSTF Grade A). - Rosen's Emergency Medicine, pp. 1395-1396
5. Recurrent UTI - Prophylaxis
For women with ≥2 UTIs in 6 months or ≥3 in 12 months:
| Strategy | Options |
|---|---|
| Long-term low-dose (nightly) | Nitrofurantoin 50-100 mg daily; TMP-SMX 40/200 mg daily or alternate days; Cephalexin 250-500 mg daily |
| Postcoital (single dose) | Nitrofurantoin 50-100 mg; TMP-SMX 40/200 mg; Trimethoprim 100 mg |
| Non-antibiotic prevention | Increase water intake > 1.5 L/day; avoid spermicides; D-mannose 420 mg-2 g daily (especially if E. coli) |
- Goldman-Cecil Medicine, p. 924
6. Fungal UTI (Funguria)
- Treat only if symptomatic
- Fluconazole 400 mg x 1 day, then 200 mg daily x 7-14 days
- If fluconazole-resistant Candida: liposomal amphotericin (other antifungals have limited renal excretion) - Goldman-Cecil Medicine
Key Principles
- Always check local antibiograms - IDSA recommends avoiding any agent when local resistance exceeds 20%
- Culture before starting antibiotics - urine is rapidly sterilized once antibiotics begin
- Urine culture is not always needed for classic uncomplicated cystitis in young women - treat empirically
- Follow-up cultures are not needed unless symptoms persist or recur within 30 days
- Remove catheter/stent/stone when possible in complicated UTIs
Recent evidence update (2024-2026): A 2024 WikiGuidelines consensus statement (PMID 39495518, JAMA Network Open) provides updated guidance for both pediatric and adult UTI management. A 2025 meta-analysis (PMID 40228579) supports shorter antibiotic courses for pyelonephritis when appropriate agents are used - the above recommendations align with current evidence.
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