atc code p atc code p atc code p antiparasitic products, insecticides and repellents is a section 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. national issues of the atc classification may include additional codes not present in this list, which follows the who version. p antiparasitic products, insecticides and repellents human only p01 antiprotozoals p02 anthelmintics p03 ectoparasiticides, including scabicides, insecticides and repellents atcvet only qp51 antiprotozoals qp52 anthelmintics qp53 ectoparasiticides, including insecticides and repellents qp54 endectocides a b c d g h qi j l m n p r s v