What is the appropriate outpatient management for common infections such as uncomplicated community‑acquired bacterial pneumonia, uncomplicated cystitis in women, acute otitis media in children over 6 months, and uncomplicated cellulitis?

Outpatient Management of Common Infections

Community-Acquired Pneumonia (CAP)

For outpatient CAP in children under 5 years, prescribe amoxicillin 90 mg/kg/day divided into 2 doses for 5 days; for children 5 years and older, use amoxicillin 90 mg/kg/day (maximum 4 g/day) for 5 days, adding a macrolide only if atypical pathogens (Mycoplasma, Chlamydia) are suspected based on clinical presentation. 1

Treatment Algorithm for Pediatric CAP:

Children < 5 years:

• First-line: Amoxicillin 90 mg/kg/day in 2 doses 1
• Alternative: Amoxicillin-clavulanate (90 mg/kg/day amoxicillin component) 1
• Duration: 5 days minimum, extending only if clinical instability persists 2
• Macrolides are NOT routinely needed in this age group 3

Children ≥ 5 years:

• First-line: Amoxicillin 90 mg/kg/day (max 4 g/day) 1
• Add macrolide (azithromycin 10 mg/kg day 1, then 5 mg/kg days 2-5) if clinical picture suggests atypical pathogens 1
• Duration: 5 days for uncomplicated cases 2

Critical Clinical Stability Criteria (must ALL be present to stop antibiotics at 5 days):

• Afebrile for 24 hours
• Normal vital signs for age
• Able to eat normally
• Normal mental status 2

Common Pitfall: Prescribing 10-day courses remains widespread despite evidence supporting 5-day therapy 4. Recent data shows 81% of CAP prescriptions in pediatric EDs exceed recommended duration 4.

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Uncomplicated Cystitis in Women

For acute uncomplicated cystitis, prescribe nitrofurantoin monohydrate/macrocrystals 100 mg twice daily for 5 days as first-line therapy; trimethoprim-sulfamethoxazole 160/800 mg twice daily for 3 days is acceptable only if local resistance is known to be <20%. 5

Treatment Selection Algorithm:

First-line options (in order of preference):

1. Nitrofurantoin 100 mg twice daily × 5 days 5

   • Preferred due to minimal resistance and low collateral damage
   • Avoid if pyelonephritis suspected (inadequate tissue penetration)

2. Trimethoprim-sulfamethoxazole (TMP-SMX) 160/800 mg twice daily × 3 days 5

   • Use ONLY if:
     • Local E. coli resistance <20% AND
     • Not used for UTI in past 3 months 5

3. Fosfomycin 3 g single dose 5

   • Lower efficacy than above options
   • Reserve for patients unable to tolerate other agents

Avoid fluoroquinolones for simple cystitis due to collateral damage concerns and rising resistance 5

Key Decision Point: If patient has fever, flank pain, or systemic symptoms, treat as pyelonephritis, not cystitis 5

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Acute Otitis Media (AOM) in Children > 6 Months

For children 2 years and older with uncomplicated AOM, prescribe amoxicillin 90 mg/kg/day divided into 2 doses for 5 days; children under 2 years require 10 days of treatment. 1, 4

Age-Based Treatment Protocol:

Children ≥ 2 years:

• Amoxicillin 90 mg/kg/day in 2 doses × 5 days 1
• Consider observation without antibiotics if:
  • Mild symptoms (no severe otalgia, fever <39°C)
  • Reliable follow-up available
  • Age > 2 years 6

Children 6 months to < 2 years:

• Amoxicillin 90 mg/kg/day in 2 doses × 10 days 1
• Lower threshold for immediate antibiotic treatment

Alternative for penicillin allergy (non-anaphylactic):

• Cefdinir, cefuroxime, or cefpodoxime 6

Alternative for severe penicillin allergy:

• Azithromycin or clarithromycin 6

Critical Pitfall: Recent audit data shows only 22% of AOM prescriptions follow guideline-recommended duration, with 67% prescribing excess duration 4. The most common error is prescribing 10 days for children ≥2 years when 5 days is sufficient.

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Uncomplicated Cellulitis

For nonpurulent cellulitis without systemic toxicity, prescribe a beta-lactam antibiotic active against streptococci (cephalexin 500 mg four times daily or dicloxacillin 500 mg four times daily) for 5-6 days with close follow-up. 2

Treatment Algorithm:

Nonpurulent cellulitis (no abscess, no purulent drainage):

• First-line: Cephalexin 500 mg QID × 5-6 days 2
• Alternative: Dicloxacillin 500 mg QID × 5-6 days
• Target: Streptococcus pyogenes (Group A Strep) 2

Purulent cellulitis or concern for MRSA:

• Add MRSA coverage: TMP-SMX or doxycycline
• Consider clindamycin if severe 1

Requirements for outpatient management:

• Patient able to self-monitor
• Close primary care follow-up available
• No systemic signs (fever, hypotension, altered mental status)
• No rapidly progressive symptoms 2

When to hospitalize:

• Systemic toxicity present
• Immunocompromised host
• Failed outpatient therapy
• Concern for necrotizing infection

Evidence Note: The 5-6 day duration represents a significant departure from traditional 10-14 day courses, supported by recent high-quality evidence showing equivalent outcomes with shorter therapy 2.

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Key Universal Principles

Follow-up timing: All patients should be reassessed at 48-72 hours if not improving 6, 1. Deterioration or lack of improvement mandates re-evaluation and consideration of alternative diagnoses or complications.

Resistance considerations: Local antibiograms should guide empiric choices when available. The evidence consistently shows geographic variability in resistance patterns 5.

Duration emphasis: The strongest recent evidence supports shorter antibiotic courses than historically prescribed across all these conditions 2. Extending beyond recommended durations increases adverse effects and resistance without improving outcomes.