idursulfase idursulfase idursulfase (brand name elaprase), manufactured by takeda, is a drug used to treat hunter syndrome (also called mps-ii). it is a purified form of the lysosomal enzyme iduronate-2-sulfatase and is produced by recombinant dna technology in a human cell line. idursulfaseclinical dataahfs/drugs.commonographlicense data eu ema: by inn atc codea16ab09 (who) identifierscas number50936-59-9 ydrugbankdb01271 ychemspidernoneunii5w8jgg2651keggd04499 ychemblchembl1201826 n ny (what is this?) (verify) it is one of the most expensive drugs ever produced, costing us$567,412 per patient per year.