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Difficulty: EasyGeneral Internal Medicine

An inpatient physician is preparing discharge orders for a 55-year-old male patient. The patient was admitted 72 hours ago for community-acquired pneumonia and was empirically started on intravenous ceftriaxone and azithromycin. His cough and shortness of breath have significantly improved. He has been afebrile for the past 24 hours, his vital signs are currently within normal limits, and he is tolerating an oral diet. Blood and sputum cultures obtained on admission have both grown *Streptococcus pneumoniae*. Antimicrobial susceptibility testing reveals the organism is susceptible to penicillin, amoxicillin, ceftriaxone, levofloxacin, and linezolid. He has no known drug allergies. Which of the following is the most appropriate next step in pharmacotherapy to complete this patient's treatment course?

  1. Oral amoxicillinAnswer
  2. B
    Oral levofloxacin
  3. C
    Oral amoxicillin-clavulanate
  4. D
    Oral linezolid
  5. E
    Continue intravenous ceftriaxone

Answer

Oral amoxicillin
The patient is clinically stable, afebrile, and able to take oral medications, indicating readiness for step-down from intravenous to oral antibiotic therapy. Antimicrobial stewardship guidelines strongly recommend de-escalating from empiric broad-spectrum regimens to the most targeted, narrow-spectrum agent possible once culture and susceptibility results are finalized. Amoxicillin is a narrow-spectrum aminopenicillin that is highly effective against penicillin-susceptible *Streptococcus pneumoniae*. Transitioning to oral amoxicillin will adequately treat the pneumonia while minimizing collateral damage to the patient's microbiome and reducing the risk of antibiotic resistance.

Step-by-Step Solution

1
Assess the patient's clinical stability for oral transition.
The patient is afebrile, clinically improved, and tolerating oral intake.
These criteria confirm the patient is ready to transition from intravenous to oral antibiotics.
2
Review the culture and susceptibility results.
The pathogen is Streptococcus pneumoniae, which is susceptible to penicillin and amoxicillin.
Targeted therapy must be selected based on confirmed microbiologic data rather than empiric assumptions.
3
Apply antimicrobial stewardship principles to select the definitive agent.
Oral amoxicillin is chosen over broader alternatives.
De-escalating to the narrowest spectrum agent effectively treats the infection while minimizing adverse effects and resistance pressure.

Key Concept

Antimicrobial Stewardship: De-escalation to Targeted Oral Therapy
Estimated Time:1m 0s
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Topics

General Internal Medicine

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