The above-referenced patient, HK, returns now to the family practice clinic for a follow-up visit. The pain and inflammation from the gout flare has resolved and he is taking the ß-tubulin inhibitor twice daily prophylactically and tolerating it well. Clinical laboratory results are consistent with hyperuricemia > 9 mg/dL and overproduction of uric acid. Creatinine clearance is within the normal range; uric acid stones are present. The doctor prescribes an oral medication that reduces serum urate levels in overproducers and is an appropriate drug for urate stone formers. The direct mechanism of action of this drug is most likely:

The above-referenced patient, HK, returns now to the family practice clinic for a follow-up visit. The pain and inflammation from the gout flare has resolved and he is taking the ß-tubulin inhibitor twice daily prophylactically and tolerating it well. Clinical laboratory results are consistent with hyperuricemia > 9 mg/dL and overproduction of uric acid. Creatinine clearance is within the normal range; uric acid stones are present. The doctor prescribes an oral medication that reduces serum urate levels in overproducers and is an appropriate drug for urate stone formers. The direct mechanism of action of this drug is most likely:



A. Formation of allantoin
B. Inhibition of thymidylate synthase
C. Prevention of neutrophil chemotaxis
D. Transrepression of gene expression
E. Xanthine oxidase inhibition


Answer: E


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Biomechanics

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