The invention relates to a connector for containers containing medicinal active ingredient, which connector makes it possible to transfer active ingredient from one container into another container.The connector (1, 1′) according to the invention comprises a first connection region (3, 3′) for the connection of a first container (2, 2′), a guide element (4, 4′), a piercing element (5, 5′) and a partition wall (6), wherein the guide element (4, 4′) has a duct (7) designed for transferring a medicinal active ingredient, the piercing element (5, 5′) is arranged, at least in certain sections, in the duct (7) and is axially movably guided within the duct (7) by the guide element (4, 4′), and, by connecting a container (2, 2′) in the first connection region (3, 3′), the piercing element (5, 5′) can be moved from a starting position, in which the piercing element (5, 5′) does not open the partition wall (6), into an end position, in which the piercing element (5, 5′) opens the partition wall (6) in order to transfer a medicinal active ingredient.
