Iontophoretic transdermal system for the administration of a t least two substances

PCT No. PCT/EP96/01327 Sec. 371 Date Dec. 15, 1997 Sec. 102(e) Date Dec. 15, 1997 PCT Filed Mar. 26, 1996 PCT Pub. No. WO96/31251 PCT Pub. Date Oct. 10, 1996A transdermal system (1) for the administration of at least two substances through the skin with the aid of an electric current has a reservoir, which comprises a storage layer (2) for the substances, and a transfer means, which may be arranged in the form of a separating layer (3), that is connected to both the reservoir and the patient's skin (5) during administration. The transdermal system also has electrodes (4) which generate a current that transports the substances from the reservoir into the skin (5). In the transdermal system (1) means for the physical separation of the substances are provided that render possible a sequential administration of the substances.