A medically active plaster for dispensing active pharmaceutical substances that are liquid at room temperature onto the skin, in particular for dispensing the antiphlogistic substance etofenamat, wherein this plaster has a structure according to Figure 1, in which the top layer (a) comprises an inert material, the backing layer (c) comprises a self-adhesive polysiloxane, in which the antiphlogistic substance, preferably etofenamat, possibly together with an agent promoting permeation through the skin, and possibly further additional substances, is incorporated in the form of a dispersion, wherein the backing layer (c) adheres directly to the top layer (a), or possibly is joined to it by means of the intermediate layer (b)； and the peelable protective layer (d) comprises an inert material, adheres to the backing layer (c) and can be easily pulled off from the latter.
