The present invention relates to the use of one or more salts of fumaric acid monoalkyl esters of the general formulaoptionally in admixture with dialkyl fumarate of the formulawherein A is a bivalent cation from the series consisting of Ca, Mg, Zn or Fe or a monovalent cation from the series Li, Na or K, respectively, and n denotes the numeral 1 or 2 depending on the type of cation, and, optionally, commonly used pharmaceutical excipients and vehicles for preparing a pharmaceutical composition in the form of micro-tablets or micro-pellets for the treatment of psoriatic arthritis, neurodermatitis, psoriasis and enteritis regionalis Crohn.
