When in doubt, look for gout.
D000493:Allopurinol / Q000627:therapeutic use; D003937:Diagnosis, Differential; D057487:Enzyme Therapy; D006073:Gout / Q000175:diagnosis* / Q000188:drug therapy*; D006801:Humans; D014969:Xanthine Oxidase
D000493:Allopurinol; D014969:Xanthine Oxidase