With Special Guest Dr. Ernest Murray

In this episode of Inpatient Update, Dr. Mason Turner is joined by hospitalist Dr. Ernest Murray to challenge two common antibiotic reflexes in hospital medicine:

• Do hospitalized patients with community-acquired pneumonia really need 5–7 days of antibiotics?
• Do we need to panic about QT prolongation every time we prescribe ciprofloxacin?

Two everyday prescribing decisions. Two long-standing assumptions. Two areas where the evidence may support a more precise approach. 

Articles & PubMed Links

3–4 Days vs ≥5 Days of Antibiotics for Community-Acquired Pneumonia

Annals of Internal Medicine (2026)

Target trial emulation using >55,000 CAP hospitalizations across 60+ hospitals.

Compared:

• 3–4 days antibiotics
  vs 
• ≥5 days antibiotics

After strict inclusion/exclusion criteria, ~5,600 clinically stable patients were analyzed.

Excluded:

•  Immunocompromised patients 
•  Severe chronic lung disease 
•  Drug-resistant organisms 
•  ICU-level illness 
•  COVID-19 

Primary Outcomes

•  30-day mortality 
•  Readmissions / urgent visits 
•  Antibiotic-associated C. difficile 

Key Findings

•  No significant difference in: 
  •  Mortality 
  •  Readmissions 
  •  Urgent visits 
  •  C. difficile infection 

Interpretation

In carefully selected, clinically stable CAP patients:
 → 3 days may be enough

pubmed: https://pubmed.ncbi.nlm.nih.gov/41974005/

Ciprofloxacin and QTc Prolongation

Journal of Antimicrobial Chemotherapy (2026)

Prospective study evaluating QTc before and after standard-dose ciprofloxacin.

•  Baseline ECG obtained 
•  Repeat ECG after reaching steady-state ciprofloxacin levels 

Key Findings

•  No statistically significant change in QTc 
•  Mean QTc remained essentially unchanged (~415 ms) 
•  Patients with significant QT prolongation had: 
  •  Multiple competing risk factors 
  •  Concurrent QT-prolonging medications 
  •  Electrolyte abnormalities 

Interpretation

For most stable patients:
 → Ciprofloxacin alone does not meaningfully prolong QTc

The real danger appears to be:

•  Polypharmacy 
•  Electrolyte derangements 
•  Critical illness 
•  Multiple simultaneous QT-prolonging factors 

pubmed: https://pubmed.ncbi.nlm.nih.gov/41628197/

Practice-Changing Takeaways

• Community-acquired pneumonia:
  •  Stable patients may only need 3 days of antibiotics 
  •  “Minimum 5 days” is no longer absolute dogma 
• Ciprofloxacin:
  •  QT concern should be contextual, not reflexive 
  •  Don’t deny patients effective oral therapy solely out of generalized QT fear 

Clinical Pearls

•  Antibiotics may not need to “eradicate” infection completely — just shift the balance enough for the immune system to finish the job 
•  Lung microbiome preservation may become increasingly important in future stewardship strategies 
•  Most dangerous QT events are multifactorial, not caused by a single medication in isolation 
•  Ciprofloxacin remains an extremely valuable oral option for: 
  •  Gram-negative bacteremia 
  •  Pseudomonas coverage 
  •  Avoiding PICC lines and prolonged IV therapy 

Bottom Line

If you change nothing else this week:

•  Consider stopping CAP antibiotics after 3 days in carefully selected stable patients 
•  Use ciprofloxacin thoughtfully — but don’t reflexively fear the QTc

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