USMLE Step 1 Quiz
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PHARMACOLOGY
Question 1 of 20
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A 68-year-old woman with a history of recurrent urinary tract infections is prescribed ciprofloxacin for pyelonephritis. Several days into the treatment, she develops severe pain in her posterior ankle, making it difficult to walk. Physical examination reveals tenderness and swelling over the Achilles tendon.
The drug responsible for this patient's symptoms acts by inhibiting which of the following?
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