atc code m04 atc code m04 atc code m04 antigout preparations is a therapeutic subgroup of the anatomical therapeutic chemical classification system, a system of alphanumeric codes developed by the world health organization (who) for the classification of drugs and other medical products. subgroup m04 is part of the anatomical group m musculo-skeletal system. atc codes m musculo-skeletal system m01 anti-inflammatory and antirheumatic products m02 topical products for joint and muscular pain m03 muscle relaxants m04 antigout preparations m05 drugs for treatment of bone diseases m09 other drugs for disorders of the musculo-skeletal system a b c d g h qi j l m n p r s v codes for veterinary use (atcvet codes) can be created by placing the letter q in front of the human atc code: for example, qm04. national issues of the atc classification may include additional codes not present in this list, which follows the who version. m04a antigout preparations m04aa preparations inhibiting uric acid production m04aa01 allopurinol m04aa02 tisopurine m04aa03 febuxostat m04aa51 allopurinol, combinations m04ab preparations increasing uric acid excretion m04ab01 probenecid m04ab02 sulfinpyrazone m04ab03 benzbromarone m04ab04 isobromindione m04ab05 lesinurad m04ac preparations with no effect on uric acid metabolism m04ac01 colchicine m04ac02 cinchophen m04ax other antigout preparations m04ax01 urate oxidase m04ax02 pegloticase