Prostatitis - acute
Exam Tips
- In a febrile man with dysuria + perineal pain + tender boggy prostate, think acute bacterial prostatitis and assess for sepsis early.
- Perform DRE gently; avoid vigorous prostatic massage and do not send expressed prostatic secretions in suspected acute disease due to pain and sepsis risk.
- Always send MSU for culture before or soon after starting antibiotics, then narrow therapy to sensitivities at 48-hour review.
- Know UK first-line doses: ciprofloxacin 500 mg BD or ofloxacin 200 mg BD for 14 days; trimethoprim 200 mg BD if fluoroquinolone unsuitable.
- Fluoroquinolone safety is a frequent viva point: warn about potentially prolonged disabling adverse effects (tendon, neurological, musculoskeletal); stop immediately if these occur.
- Failure to improve within 48 hours, urinary retention, or systemic toxicity should trigger urgent hospital/urology escalation and consideration of abscess imaging.
Definition
Acute bacterial prostatitis is an acute, severe infection of the prostate gland, usually caused by uropathogenic bacteria and typically accompanied by lower urinary tract infection. It is a urological emergency in some patients because rapid progression to urinary retention, bacteraemia, or sepsis can occur if treatment is delayed.
Pathophysiology
Most cases arise from ascending infection of the urethra/bladder into prostatic ducts, with intraprostatic inflammation causing oedema, gland swelling, and painful capsular distension; less commonly there is haematogenous spread. Gram-negative Enterobacterales (especially Escherichia coli) predominate, though Pseudomonas, Klebsiella, Proteus, Enterobacter, Serratia, and Enterococcus are also implicated, and STI pathogens (e. g, Neisseria gonorrhoeae, Chlamydia trachomatis) are occasional causes in at-risk men. Inflammation can obstruct prostatic urethral outflow, explaining hesitancy/retention, while bacterial translocation may lead to bacteraemia and sepsis. Post-instrumentation infections are more likely to involve resistant/non-E. coli organisms and carry higher risk of prostatic abscess. See Figure: schematic of ascending urinary infection and prostate involvement.
Risk Factors
- Recent urethral or lower urinary tract instrumentation
- Bladder outlet obstruction (e. g, benign prostatic enlargement)
- Indwelling urinary catheter or recent catheterization
- Diabetes mellitus
- Immunocompromised state
- Recent urinary tract infection
- Urinary tract structural abnormality
- Perineal/urethral trauma
- Risk factors for sexually transmitted infection
Clinical Features
Symptoms
- Dysuria, urinary frequency, urgency
- Perineal, penile, suprapubic, or rectal pain
- Obstructive voiding symptoms (hesitancy, weak stream, straining)
- Acute urinary retention
- Low back pain
- Painful ejaculation
- Systemic upset: fever, rigors, myalgia, arthralgia, malaise
Signs
- Pyrexia and tachycardia
- Tender, enlarged, warm or boggy prostate on gentle digital rectal examination
- Distended palpable bladder if retention is present
- Costovertebral angle tenderness if concurrent upper UTI/pyelonephritis
- Features of sepsis in severe disease
Investigations
Management
Lifestyle Modifications
- Maintain hydration and avoid dehydration
- Safety-net: seek urgent review if worsening, systemic deterioration, or no improvement within 48 hours
- Provide clear explanation that symptom resolution may take several weeks
- Arrange early follow-up (around 48 hours) with culture review and antibiotic rationalization
Pharmacological Treatment
First-line oral antibiotics (adults, UK primary care where appropriate)
- Ciprofloxacin 500 mg twice daily for 14 days
- Ofloxacin 200 mg twice daily for 14 days
- Trimethoprim 200 mg twice daily for 14 days (if fluoroquinolone not appropriate)
Choose using severity, prior cultures/resistance, and recent antibiotic exposure; review at 48 hours and tailor to sensitivities with the narrowest effective agent.
Second-line oral antibiotics (specialist advice)
- Levofloxacin 500 mg once daily for 14 days
- Co-trimoxazole 960 mg twice daily for 14 days
Use co-trimoxazole only when susceptibility is confirmed and there is a clear reason to prefer it.
Analgesia/antipyretics
- Paracetamol (standard adult dosing)
- Codeine low-dose as add-on if needed
- Ibuprofen if suitable and no contraindication
Use renal/GI/cardiovascular risk assessment before NSAIDs.
IV therapy / inpatient management
- Intravenous antibiotics per local microbiology protocol for severe disease or inability to take oral therapy
Admit if severe symptoms, sepsis, retention, suspected abscess, or failure to improve within 48 hours.
Surgical / Interventional
- Urgent bladder drainage for acute urinary retention (often specialist-led; avoid traumatic urethral instrumentation where possible)
- Urology referral for suspected or confirmed prostatic abscess, with drainage if required
- Post-recovery urological investigation to identify structural urinary tract abnormalities
Complications
- Acute urinary retention
- Bacteraemia
- Sepsis
- Prostatic abscess
- Epididymitis/epididymo-orchitis
- Pyelonephritis
- Progression to chronic bacterial prostatitis or chronic pelvic pain syndrome
- Recurrence of infection
Prognosis
Most men improve with prompt, culture-directed antibiotics, but recovery speed depends on initial severity. Around 10% may develop chronic prostatitis/chronic pelvic pain syndrome, recurrence occurs in roughly 13%, and rare abscess formation (about 0.5-2.5% across prostate disease cohorts) worsens outcomes and may need intervention.
Sources & References
🏥BMJ Best Practice(1)
💊BNF Drug References(6)
- Amikacin[management.pharmacological]
- Ceftriaxone[management.pharmacological]
- Cefuroxime[management.pharmacological]
- Ciprofloxacin[management.pharmacological]
- Co-trimoxazole[management.pharmacological]
- Trimethoprim[management.pharmacological]
✅NICE Guidelines(1)
- Prostatitis - acute[overview]
📖Textbook References(8)
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1824)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1824)[context]
- [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 776, 777)[context]
- [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 777)[context]
- [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 660)[context]
- [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 660, 661)[context]
- [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 1373, 1374)[context]
- [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 1343, 1344)[context]