A new patient who injects drugs presents with track marks and purulent drainage. Which antibiotic would be appropriate to order?

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Study for the BIPC Substance Abuse and Disorders Exam. Challenge yourself with a variety of questions to enhance your knowledge and strengthen your preparation. Each question comes with hints and explanations to help you understand and retain crucial information.

Multiple Choice

A new patient who injects drugs presents with track marks and purulent drainage. Which antibiotic would be appropriate to order?

Explanation:
When a patient who injects drugs presents with track marks and purulent drainage, the infection is most likely a skin and soft tissue infection caused by Staphylococcus aureus, including MRSA in many community cases. The best initial choice is an antibiotic with reliable activity against MRSA, which makes trimethoprim-sulfamethoxazole (Bactrim) the most appropriate option here. Bactrim covers MRSA and is effective for uncomplicated purulent SSTIs, making it superior to agents that don’t reliably cover MRSA. Keflex mainly targets MSSA and streptococci and has limited MRSA activity, so it’s less dependable for purulent SSTIs where MRSA is a concern. Macrobid is used primarily for urinary tract infections and isn’t suitable for skin infections. Flagyl targets anaerobes and is not appropriate for typical aerobic skin pathogens like Staph aureus. If there are sulfa allergies or drug interactions to consider, or if the infection is more severe or systemic, other IV options (such as vancomycin or linezolid) might be needed, but for this scenario, Bactrim is the best fit.

When a patient who injects drugs presents with track marks and purulent drainage, the infection is most likely a skin and soft tissue infection caused by Staphylococcus aureus, including MRSA in many community cases. The best initial choice is an antibiotic with reliable activity against MRSA, which makes trimethoprim-sulfamethoxazole (Bactrim) the most appropriate option here.

Bactrim covers MRSA and is effective for uncomplicated purulent SSTIs, making it superior to agents that don’t reliably cover MRSA. Keflex mainly targets MSSA and streptococci and has limited MRSA activity, so it’s less dependable for purulent SSTIs where MRSA is a concern. Macrobid is used primarily for urinary tract infections and isn’t suitable for skin infections. Flagyl targets anaerobes and is not appropriate for typical aerobic skin pathogens like Staph aureus.

If there are sulfa allergies or drug interactions to consider, or if the infection is more severe or systemic, other IV options (such as vancomycin or linezolid) might be needed, but for this scenario, Bactrim is the best fit.

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