Amino Acid Transamination & Nitrogen | USMLE Step 1
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A 47-year-old man receiving isoniazid for latent tuberculosis develops burning and tingling in both feet after several months of treatment. His food intake has been poor, and he has not taken the prescribed vitamin supplement. Examination shows reduced ankle reflexes and distal sensation. The clinician suspects depletion of the vitamin cofactor associated with this drug.