MSFinals-2500

A 50-year-old man presents to the rheumatology clinic after experiencing an acute monoarthropathy in his left big toe’s metatarsophalangeal joint. The synovial fluid analysis revealed the presence of negatively birefringent crystals under polarised light. After resolving the inflammation with acute treatment, the rheumatologist decides to start prophylactic treatment with allopurinol to prevent future occurrences. What is the most suitable medication to begin with allopurinol?