The invention relates to a connector for a container (2) containing a medicinal active substance. The connector (1, 1) according to the invention comprises a first connection region (3a, 3a) for connecting a first container (2), a piercing element (4, 4) and a breaking element (5), wherein the piercing element (4, 4) has a first end section (6a, 6a) and a second end section (6b, 6b) and a channel (7) running from the first end section (6a, 6a) to the second end section (6b, 6b) for transporting a medicinal active substance, wherein the first end section (6a, 6a) is designed to pierce a membrane (8) of the first container (2) connected in the first connection region, and on the second end section (6b, 6b) the breaking element (5) is fastened in a breakable manner, wherein the breaking element (5) seals the channel (7) of the piercing element (4, 4) in a liquid-tight manner when in the fastened state.
