Uti treatment
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"urinary tract infection" AND treatment
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I now have comprehensive data. Here is a structured, evidence-based summary of UTI treatment:
UTI Treatment
Classification First
| Type | Definition |
|---|---|
| Uncomplicated cystitis | Lower UTI in non-pregnant adult women, no structural abnormality |
| Complicated UTI | Male, pregnant, catheter-associated, immunocompromised, structural/functional urinary tract abnormality, or pyelonephritis |
| Asymptomatic bacteriuria | Positive culture without symptoms — only treat in pregnancy and pre-urologic procedures |
1. Uncomplicated Cystitis (Adult Women)
No urine culture needed before starting treatment.
| Agent | Dose & Duration | Notes |
|---|---|---|
| Nitrofurantoin macrocrystals | 100 mg PO BID × 5 days | First-line; avoid if GFR <30 or pyelonephritis suspected |
| TMP-SMX DS | 160/800 mg PO BID × 3 days | First-line if local resistance <20% |
| Fosfomycin | 3 g PO single dose | Convenient; avoid if pyelonephritis suspected |
| Pivmecillinam | 400 mg PO BID × 5 days | Not available in the US |
| Amoxicillin-clavulanate, cefpodoxime, cefdinir, cefaclor | 3–7 day regimens | Second-line when above cannot be used |
Fluoroquinolones should be reserved for more serious uses — avoid for routine uncomplicated cystitis given resistance and side-effect profile (tendon rupture, aortic wall tear, hypoglycemia, mental health effects).
2. Complicated UTI / Pyelonephritis (Outpatient)
Obtain urine culture before starting. Treat 7–14 days (7 days for mild, 14 days for severe/clear pyelonephritis).
| Agent | Dose |
|---|---|
| Ciprofloxacin | 500 mg PO BID × 5–7 days |
| Levofloxacin | 750 mg PO once daily × 5–7 days |
| TMP-SMX DS | BID × 14 days (if susceptible) |
| Amoxicillin-clavulanate | 875/125 mg PO BID × 7–14 days |
| Cefpodoxime | 400 mg PO BID × 7–14 days |
Consider an initial IV dose of ceftriaxone if susceptibility is uncertain.
3. Pyelonephritis / Complicated UTI (Inpatient IV)
| Agent | Dose |
|---|---|
| Ciprofloxacin | 400 mg IV q12h |
| Ceftriaxone | 1–2 g IV once daily |
| Cefotaxime | 1–2 g IV q8h |
| Cefepime | 1–2 g IV q8h |
| Piperacillin-tazobactam | 3.375 g IV q6h |
| Gentamicin/Tobramycin | 3 mg/kg/day ÷ q8h ± ampicillin |
| Ertapenem | 1 g IV daily |
| Meropenem/Imipenem | For MDR organisms |
Step down to oral therapy after clinical improvement. Total course: 7–14 days for most; up to 21 days for sepsis syndrome.
4. UTI in Pregnancy
- Screen for asymptomatic bacteriuria at 12–16 weeks (or first prenatal visit) — treat even if asymptomatic (up to 30% progress to pyelonephritis if untreated)
- Treat lower UTI/asymptomatic bacteriuria for 7–10 days
| Safe agents in pregnancy | Notes |
|---|---|
| Cephalexin 500 mg PO BID × 3–7 days | Preferred |
| Nitrofurantoin 100 mg PO BID × 3–7 days | Avoid near term (neonatal hemolysis risk) |
| Amoxicillin 500 mg TID × 7 days | |
| TMP-SMX BID × 3 days | Avoid in 3rd trimester |
Avoid: Fluoroquinolones, tetracyclines in pregnancy.
For pyelonephritis in pregnancy: admit for IV antibiotics (ceftriaxone 1 g IV daily), IV hydration, obstetric consult, follow-up cultures.
5. Recurrent UTI
Defined as ≥2 UTIs in 6 months or ≥3 in 12 months.
- Culture and treat empirically; refer for prophylaxis options
- Prophylaxis strategies: continuous, postcoital, or patient-initiated intermittent self-treatment
- Avoid spermicide use (increases risk)
- Relapses: use an alternative agent class
6. Special Pathogens
- ESBL producers: Carbapenems are drug of choice for serious infections; carbapenem-sparing strategies (quinolones, cefepime) for less severe infections if susceptible
- Carbapenem-resistant organisms (CRO): Novel β-lactam/β-lactamase inhibitor combinations: ceftazidime-avibactam, cefiderocol, meropenem-vaborbactam, imipenem-relebactam (consult ID)
- S. saprophyticus: Nitrofurantoin is not effective — use TMP-SMX or fluoroquinolone
Key Points
- Always check local antibiograms — if TMP-SMX resistance ≥20% locally, choose a different agent
- Catheter-associated UTI (CAUTI): Remove or replace catheter before sending culture and starting antibiotics
- Asymptomatic bacteriuria outside pregnancy and pre-urologic procedures: do not treat
Sources: Tintinalli's Emergency Medicine, Table 91-5 & 91-6; Rosen's Emergency Medicine; Goldman-Cecil Medicine, Ch. 281
Recent evidence: A 2024 WikiGuidelines consensus statement (PMID 39495518, JAMA Network Open) on UTI prevention, diagnosis, and management in pediatrics and adults provides updated guidance. A 2025 living meta-analysis (PMID 40228579) supports shorter antibiotic courses for pyelonephritis being non-inferior in select patients.
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