the invention relates to : a medication delivery device and a method of making such a device . the object of the present invention is to provide a handy medication delivery device that may be easily adjusted to the different needs of a given user in different situations and to the different needs of different users , and which is economic from a production point of view . the problem is solved in that it comprises a basis module and one or more replaceable modules , each of which is adapted to cooperate mechanically and / or electronically with the basis module to provide a specific function , and the basis module includes resources that are jointly used by the replaceable modules . this has the advantage of providing a rational concept for economically supplying high quality , mass - produced devices capable of being customized to individual users &# 39 ; needs for functionality by avoiding the duplication of key components . the invention may be used in injector type , medication pump type , inhaler or spray type devices for delivering a discrete dose or a continuous dose of a medication to a user .