Process for preparing a pharmaceutical composition with anti-inflammatory and analgesic activity for administration via a patch for external use, and composition thus obtained

The present invention relates to a process for preparing a pharmaceutical composition with anti-inflammatory and analgesic activity for administration via a patch for external use, its components including as active principle a salt of diclofenac, 2[(2,6-dichlorophenyl)amino]benzene-acetic acid, with a cyclic organic base chosen from hydroxyethylpyrrolidine or hydroxyethylpiperidine characterized in that said active principle is added to a mixture of one or more of said components, in the form of a solution in water and propylene glycol in a ratio of about 1:1 parts by weight.