<prompt> Allopurinol potentiates the action of:CoicosteroidsProbenecid6-MercaptopurineAmpicilin  <response>: Allopurinol: used for chronic gout Reduces uric acid synthesis by competitively inhibiting xanthine oxidase Allopurinola Alloxanthine a noncompetitive inhibitor of xanthine oxidase ESSENTIALS OF MEDICAL PHARMACOLOGY;7TH EDITION;KD TRIPATHI;PAGE NO 216 