The invention relates to a closure cap (1) for a container (2) for receiving a pharmaceutical substance, in particular for an infusion or transfusion bottle, with a flanged cap (4) which is suitable for engagement around a container neck (8) and which has a metal film layer, wherein the flanged cap (4) also has a recess (5) that is covered by a plastic lid (3), the plastic lid (3) is connected to the flanged cap (4) by means of at least one connection element (9) formed on the underside, and the plastic lid (3) is removable at least in part. In order to provide a closure cap for a container for receiving a pharmaceutical substance, which container is safe to handle and meets strict demands regarding its tamper-proofing, it is proposed that the plastic lid (3) is connected to the flanged cap (4) via a plurality of connection elements (9) which are formed on its underside and pass through associated connection openings (11) formed in the flanged cap (4), and that the plastic lid (3), in order to expose the recess (5), has a tear-off tab (12) which extends from a coverage of the recess (5) as far as an edge of the plastic lid (3), wherein no connection between the plastic lid and the flanged cap (4) is formed in the area of the tear-off tab (12).