Aqueous patches containing diclofenac sodium

An aqueous patch containing diclofenac sodium in which 5% or less of diclofenac sodium and 5% or less of crotamiton per plaster weight are contained, wherein the patch contains a homogeneous mixed solution of diclofenac sodium in a plaster, wherein the solution is obtained by mixing crotamiton, diclofenac sodium and water in the mixture ratio of crotamiton/diclofenac sodium of 8.0 or less and the mixture ratio of (water+crotamiton)/diclofenac sodium of 3.0-20.0.

A process for preparing an aqueous patch containing diclofenac sodium characterized in that the process comprises mixing crotamiton, diclofenac sodium and water in the mixture ratio of crotamiton/diclofenac sodium of 8.0 or less and the mixture ratio of (water+crotamiton)/diclofenac sodium of 3.0-20.0 to obtain a homogeneous mixed solution of diclofenac sodium, followed by adding other ingredients of a plaster to this solution by a conventional method, and then spreading the obtained plaster composition (plaster) on a support.

A process for preparing an aqueous patch containing diclofenac sodium characterized in that the process comprises mixing crotamiton, diclofenac sodium and water in the mixture ratio of crotamiton/diclofenac sodium of 8.0 or less and the mixture ratio of (water+crotamiton)/diclofenac sodium of 3.0-20.0 to obtain a homogeneous mixed solution of diclofenac sodium, followed by adding other ingredients of a plaster to this solution by a conventional method to obtain a plaster composition containing 5% or less of diclofenac sodium and 5% or less of crotamiton per plaster weight, and then spreading the composition on a support.