Abstract: A pilfer-proof device for storing individually wrapped sticking plasters. The device comprises a support and at least one cassette holding securely a plurality of wrapped plasters. The cassette is removably attached to the support by a locking clip. The device further comprises a locking bar being able to lock said cassette on said support into a non-removable position. The security bar is moveable with respect to the support between a first position wherein said locking means cooperates with said cassette to lock said cassette in said non-removable position and a second position wherein said locking clip does not lock said cassette. Further, the support is further provided with a lock to restrict movement of the bar from the first position.