Most new pharmaceuticals are designed to treat new indications, and after a successful launch the maker invariably seeks to rely on its brand power and patent protection to establish a dominant position in markets throughout the world.
新藥的研發大多針對新適應症而來，成功上市之後勢必挾其品牌專利「鯨吞」國內外市場，在嚴密的專利保護下，其他藥廠不能仿造，亦難以染指。