The invention relates to a carrier for pharmaceutical compositions, the carrier comprising at least a first and a second portion. Each of the first and second portions comprises at least two cavities for housing pharmaceutical composition, and at least one cover sheet covering said at least two cavities. The cavities of the first and second portions are arranged so that the first and second portions can be placed in an overlapping configuration with the cavities of the first portion positioned in spaces between the cavities of the second portion. At least one of the cavities of the first portion comprises at least one bulge, and at least one of the cavities of the second portion comprises at least one depression adapted to engage with said at least one bulge to form a mutual engagement between the first and second portions. By this engagement, mutual movement of the first and second portions is restricted, so that a rigid structure is produced. The invention further relates to a pharmaceutical package such a carrier and a container for holding said carrier.