An arrangement comprising an intrauterine system (1; 17), an inserter for the intrauterine system and a package for the inserter, wherein - the inserter comprises a handle (3; 13) having a first end and a second end, - an insertion tube (6; 15;19) having a first end and a second end, - first handling means (5; 14) for withdrawing the intrauterine system inside the insertion tube and - second handling means for expulsing the intrauterine system from the insertion tube (6; 15;19), and - the package comprises a container, a cover arranged to close the container and means for actioning the first handling means of the inserter, - the second handling means is a plunger having a first end and a second end, attached by its second end to the handle (3; 13), - the insertion tube (6; 15; 19) is arranged around the plunger, characterized in that, - the handle (3; 13) of the inserter has a longitudinal opening at its first end, said opening having a longitudinal axis parallel to the longitudinal axis of the inserter, - the first handling means comprises - a movable slider (5; 14) arranged in said longitudinal opening and having a first end and a second end, and - locking means for reversibly locking the intrauterine system in relation to the second handling means via a removal string of the intrauterine system (1; 17), - wherein the means for actioning the first handling means is a locking throttle wherein said locking throttle is a separate part surrounding the insertion tube whilst the throttle is kept in its place in the package by a locking part, the locking throttle being configured to exert a frictional force on the insertion tube (6; 15; 19) when the inserter is removed from the package. - the inserter comprises a handle (3; 13) having a first end and a second end, - an insertion tube (6; 15;19) having a first end and a second end, - first handling means (5; 14) for withdrawing the intrauterine system inside the insertion tube and - second handling means for expulsing the intrauterine system from the insertion tube (6; 15;19), and - the package comprises a container, a cover arranged to close the container and means for actioning the first handling means of the inserter, - the second handling means is a plunger having a first end and a second end, attached by its second end to the handle (3; 13), - the insertion tube (6; 15; 19) is arranged around the plunger, - the handle (3; 13) of the inserter has a longitudinal opening at its first end, said opening having a longitudinal axis parallel to the longitudinal axis of the inserter, - the first handling means comprises - a movable slider (5; 14) arranged in said longitudinal opening and having a first end and a second end, and - locking means for reversibly locking the intrauterine system in relation to the second handling means via a removal string of the intrauterine system (1; 17), - a movable slider (5; 14) arranged in said longitudinal opening and having a first end and a second end, and - locking means for reversibly locking the intrauterine system in relation to the second handling means via a removal string of the intrauterine system (1; 17), - wherein the means for actioning the first handling means is a locking throttle