An anhydrous multiphase gel system consisting of an outer lipid matrix and an inner phase gelled by means of a polymer is described, which can be obtained by a) Melting the lipid phase with the formation of a liquid lipid phase, b) Mixing and homogenizing polymers or polymer blends capable of swelling with the formation of a polymer phase to be dispersed, c) Combining the polymer phase with the liquid lipid phase and homogenizing the phases, and d) Cold stirring the phase mixture until a solid gel-like mixed structure of the entire system is formed. The anhydrous multiphase gel system is particularly suitable for taking up difficultly soluble active substances in high concentration and for providing topical and transdermal applications. The described system is called an EDRS, “Entrapped Drug Reservoir System”.
