CLINICAL PRINTABLE
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A one-page Uncomplicated Cystitis clinical reference is on the way.
1 · Recognition / Alarm Features
- Uncomplicated cystitis: dysuria, urinary frequency, urgency, suprapubic discomfort in a non-pregnant, non-immunocompromised woman without structural or functional urinary tract abnormality. Diagnosis is clinical — urine culture is not required for uncomplicated cystitis in otherwise healthy women.
- Complicated UTI features: male sex, pregnancy, diabetes, immunosuppression, structural abnormality (obstruction, stent, nephrostomy), functional abnormality (neurogenic bladder), recent urologic procedure, hospital-acquired infection, symptoms >7 days, or failure of prior antibiotic therapy. Complicated UTI requires urine culture and longer treatment duration.
- Asymptomatic bacteriuria (ASB): positive urine culture without UTI symptoms. Common in elderly women (up to 20%), catheterized patients, and diabetics. Treat ASB only in: pregnant women (risk of pyelonephritis and preterm birth) and patients undergoing urologic procedures with mucosal disruption. Do NOT treat ASB in all other patients — treatment increases antibiotic resistance and adverse effects without benefit.
- Urinalysis interpretation: pyuria (>10 WBC/hpf) supports UTI but is not diagnostic — pyuria occurs in many conditions (STIs, interstitial nephritis, contamination). Bacteriuria on UA supports UTI but is not diagnostic without symptoms. Treat symptoms, not the urinalysis.
- Recurrent UTI: ≥2 episodes in 6 months or ≥3 in 12 months. Evaluate for anatomic abnormality, incomplete bladder emptying, and behavioral risk factors. Urine culture at each episode. Consider prophylactic antibiotics or post-coital antibiotics.
2 · Differential / Secondary Causes
Pyelonephritis
Fever, chills, flank pain, CVA tenderness, nausea/vomiting — with or without lower urinary tract symptoms. Urine culture required. Blood cultures if systemic toxicity. IV antibiotics for severe cases. See Pyelonephritis Deep Dive.
Urethritis / STI
Dysuria without frequency or urgency, or with vaginal discharge. Consider Chlamydia trachomatis, Neisseria gonorrhoeae, herpes simplex. NAAT for GC/Chlamydia. Treat with ceftriaxone + doxycycline.
Interstitial cystitis / bladder pain syndrome
Chronic pelvic pain, urinary urgency/frequency, dyspareunia. Negative urine culture. Diagnosis of exclusion. Refer to urology. Treatments: pentosan polysulfate, intravesical therapy, pelvic floor physical therapy.
Vaginitis
Vaginal discharge, vulvar pruritus, external dysuria (burning on urination from urine contact with inflamed vulva). Distinguish from internal dysuria (felt inside the urethra/bladder). Vaginal pH, wet prep. See Vaginitis Deep Dive.
3 · Treatment Pathway
First-line antibiotics — uncomplicated cystitis
Nitrofurantoin monohydrate/macrocrystals (Macrobid) 100 mg BID for 5 days: first-line. Avoid if CrCl <30 mL/min (ineffective). Trimethoprim-sulfamethoxazole (TMP-SMX) DS 160/800 mg BID for 3 days: first-line if local resistance <20%. Fosfomycin 3 g single dose: effective, convenient, but more expensive.
Avoid fluoroquinolones for uncomplicated cystitis
Fluoroquinolones (ciprofloxacin, levofloxacin) are NOT recommended for uncomplicated cystitis — reserve for complicated UTI and pyelonephritis. Reasons: collateral damage (C. diff, resistance selection), adverse effects (tendinopathy, QT prolongation, CNS effects), and equivalent alternatives exist.
Symptomatic relief
Phenazopyridine (Pyridium) 200 mg TID for 2 days: urinary analgesic, relieves dysuria and urgency. Turns urine orange — warn patients. Not an antibiotic. Adequate hydration. Symptoms typically improve within 24–48 hours of antibiotics.
Recurrent UTI — prevention
Behavioral: void after intercourse, adequate hydration, avoid spermicides. Post-coital prophylaxis: single-dose nitrofurantoin or TMP-SMX after intercourse. Continuous prophylaxis: low-dose nitrofurantoin or TMP-SMX nightly for 6–12 months. Vaginal estrogen in postmenopausal women (reduces recurrence by 50%). Cranberry products: modest evidence, safe to recommend.
4 · Expected Response
- Uncomplicated cystitis: symptom improvement within 24–48 hours of antibiotics. Complete resolution in 3–5 days. Urine culture and test of cure are not required after treatment of uncomplicated cystitis.
- No improvement at 48–72 hours: consider resistant organism, pyelonephritis, or alternative diagnosis. Urine culture and sensitivity.
- Recurrent UTI on prophylaxis: breakthrough infections require urine culture and sensitivity to guide treatment.
5 · Escalation
- Development of fever, chills, flank pain, or CVA tenderness: pyelonephritis. Urine culture, blood cultures if systemic toxicity, IV antibiotics for severe cases.
- Recurrent UTI (≥2 in 6 months): urine culture at each episode, evaluate for anatomic abnormality, consider urology referral for cystoscopy.
- UTI in pregnancy: always obtain urine culture, treat ASB, use pregnancy-safe antibiotics (nitrofurantoin — avoid at term; cephalexin; amoxicillin-clavulanate). Avoid TMP-SMX in first trimester and at term.
Apply It · Change One Detail
APPLY IT
A 24-year-old healthy woman presents with 2 days of dysuria, frequency, and urgency. No fever, no flank pain, no vaginal discharge. This is uncomplicated cystitis — a clinical diagnosis. Urine culture is not required. Prescribe nitrofurantoin 100 mg BID for 5 days. Counsel that symptoms should improve within 24–48 hours. No test of cure needed. If symptoms persist at 48–72 hours, obtain a urine culture.
CHANGE ONE DETAIL
Change one detail — a 78-year-old woman in a nursing home has a urine culture showing 100,000 CFU/mL E. coli, but she has no urinary symptoms. This is asymptomatic bacteriuria — do NOT treat. Treating ASB in elderly women increases antibiotic resistance, C. diff risk, and adverse drug effects without reducing UTI frequency or improving outcomes. The urinalysis and culture were ordered without a clinical indication — this is the root of the problem.
Bottom Line
Treat symptoms, not the urinalysis. Asymptomatic bacteriuria should not be treated in most patients — only in pregnant women and patients undergoing urologic procedures. Fluoroquinolones are not first-line for uncomplicated cystitis.
EVIDENCE & REFERENCES
- Gupta K, et al. International clinical practice guidelines for the treatment of acute uncomplicated cystitis and pyelonephritis in women: A 2010 update by the IDSA and ESCMID. Clin Infect Dis. 2011;52(5):e103-120. doi:10.1093/cid/ciq257
- Nicolle LE, et al. Clinical Practice Guideline for the Management of Asymptomatic Bacteriuria: 2019 Update by the IDSA. Clin Infect Dis. 2019;68(10):e83-e110. doi:10.1093/cid/ciy1121
- Hooton TM. Clinical practice. Uncomplicated urinary tract infection. N Engl J Med. 2012;366(11):1028-1037. doi:10.1056/NEJMcp1104429