atc code c04 atc code c04 atc code c04 peripheral vasodilators 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 c04 is part of the anatomical group c cardiovascular system. atc codes c cardiovascular system c01 cardiac therapy c02 antihypertensives c03 diuretics c04 peripheral vasodilators c05 vasoprotectives c07 beta blocking agents c08 calcium channel blockers c09 agents acting on the renin–angiotensin system c10 lipid modifying agents 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, qc04. 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. c04a peripheral vasodilators c04aa 2-amino-1-phenylethanol derivatives c04aa01 isoxsuprine c04aa02 buphenine c04aa31 bamethan c04ab imidazoline derivatives c04ab01 phentolamine c04ab02 tolazoline c04ac nicotinic acid and derivatives c04ac01 nicotinic acid c04ac02 nicotinyl alcohol (pyridylcarbinol) c04ac03 inositol nicotinate c04ac07 ciclonicate c04ad purine derivatives c04ad01 pentifylline c04ad02 xantinol nicotinate c04ad03 pentoxifylline c04ad04 etofylline nicotinate qc04ad90 propentofylline c04ae ergot alkaloids c04ae01 ergoloid mesylates c04ae02 nicergoline c04ae04 dihydroergocristine c04ae51 ergoloid mesylates, combinations c04ae54 dihydroergocristine, combinations c04af enzymes c04af01 kallidinogenase c04ax other peripheral vasodilators c04ax01 cyclandelate c04ax02 phenoxybenzamine c04ax07 vincamine c04ax10 moxisylyte c04ax11 bencyclane c04ax17 vinburnine c04ax19 sulcotidil c04ax20 buflomedil c04ax21 naftidrofuryl c04ax23 butalamine c04ax24 visnadine c04ax26 cetiedil c04ax27 cinepazide c04ax28 ifenprodil c04ax30 azapetine c04ax32 fasudil