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Difficulty: EasyGeneral Internal Medicine

Match the following common outpatient clinical presentations to their most appropriate first-line oral pharmacological therapy.

  • A 24-year-old woman with 2 days of dysuria and urinary frequency, without fever or flank tenderness.Nitrofurantoin
  • A 45-year-old man with a solitary, painful, fluctuant, and purulent abscess on his anterior thigh.Trimethoprim-sulfamethoxazole
  • A 19-year-old man with fever, tonsillar exudates, and a positive rapid streptococcal antigen detection test.Amoxicillin
  • A 32-year-old woman who develops a targetoid erythema migrans rash one week after a hiking trip.Doxycycline

Answer

Uncomplicated cystitis matches with nitrofurantoin. The purulent skin abscess matches with trimethoprim-sulfamethoxazole. Streptococcal pharyngitis matches with amoxicillin. Early localized Lyme disease matches with doxycycline.
Each clinical presentation aligns perfectly with a specific first-line antibiotic based on primary care guidelines. Nitrofurantoin treats uncomplicated cystitis effectively. Trimethoprim-sulfamethoxazole is appropriately used for CA-MRSA in purulent abscesses. Amoxicillin successfully treats Group A strep pharyngitis. Doxycycline is the gold standard for early localized Lyme disease.

Step-by-Step Solution

1
Identify the underlying infectious diagnosis for each clinical vignette.
The presentations correspond to uncomplicated cystitis, purulent skin abscess (suspected MRSA), streptococcal pharyngitis, and early localized Lyme disease.
Accurate clinical diagnosis is required before selecting empirical antimicrobial therapy.
2
Assign the first-line oral antimicrobial agent for each identified condition based on standard guidelines.
Nitrofurantoin is assigned to cystitis, trimethoprim-sulfamethoxazole to the abscess, amoxicillin to pharyngitis, and doxycycline to Lyme disease.
Following evidence-based guidelines ensures optimal patient outcomes and promotes antibiotic stewardship.

Key Concept

First-line empiric antimicrobial therapy for common outpatient infections
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Topics

General Internal Medicine

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