Closure cap for use on the mouth of a pharmaceutical container (1), comprising a seal (3) of an elastomeric material which is provided with a pierceable removal point (2), which seal can be pressed against the mouth by means of a [lacuna] in the region of the bottom of the plastic closure cap (4). The closure cap (4) has at least one piercing point (5) which coincides at least partly with the removal point (2) and which can be pierced itself without prior removal of components of the closure cap (4). <IMAGE>
