atc code m03 atc code m03 atc code m03 muscle relaxants 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 m03 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, qm03. atcvet codes without corresponding human atc codes are cited with the leading q in the following list.national issues of the atc classification may include additional codes not present in this list, which follows the who version. m03a muscle relaxants, peripherally acting agents m03aa curare alkaloids m03aa01 alcuronium m03aa02 tubocurarine m03aa04 dimethyltubocurarine m03ab choline derivatives m03ab01 suxamethonium m03ac other quaternary ammonium compounds m03ac01 pancuronium m03ac02 gallamine m03ac03 vecuronium m03ac04 atracurium m03ac05 hexafluronium m03ac06 pipecuronium bromide m03ac07 doxacurium chloride m03ac08 fazadinium bromide m03ac09 rocuronium bromide m03ac10 mivacurium chloride m03ac11 cisatracurium m03ax other muscle relaxants, peripherally acting agents m03ax01 botulinum toxin m03b muscle relaxants, centrally acting agents m03ba carbamic acid esters m03ba01 phenprobamate m03ba02 carisoprodol m03ba03 methocarbamol m03ba04 styramate m03ba05 febarbamate m03ba51 phenprobamate, combinations excluding psycholeptics m03ba52 carisoprodol, combinations excluding psycholeptics m03ba53 methocarbamol, combinations excluding psycholeptics m03ba71 phenprobamate, combinations with psycholeptics m03ba72 carisoprodol, combinations with psycholeptics m03ba73 methocarbamol, combinations with psycholeptics qm03ba99 combinations m03bb oxazol, thiazine, and triazine derivatives m03bb02 chlormezanone m03bb03 chlorzoxazone m03bb52 chlormezanone, combinations excluding psycholeptics m03bb53 chlorzoxazone, combinations excluding psycholeptics m03bb72 chlormezanone, combinations with psycholeptics m03bb73 chlorzoxazone, combinations with psycholeptics m03bc ethers, chemically close to antihistamines m03bc01 orphenadrine (citrate) m03bc51 orphenadrine, combinations m03bx other centrally acting agents m03bx01 baclofen m03bx02 tizanidine m03bx03 pridinol m03bx04 tolperisone m03bx05 thiocolchicoside m03bx06 mephenesin m03bx07 tetrazepam m03bx08 cyclobenzaprine m03bx09 eperisone m03bx30 phenyramidol m03bx53 pridinol, combinations m03bx55 thiocolchicoside, combinations qm03bx90 guaifenesin m03c muscle relaxants, directly acting agents m03ca dantrolene and derivatives m03ca01 dantrolene