The present invention relates to solid pharmaceutical dosage forms comprising the drug substance 3-(2,6-dichloro-3,5-dimethoxy-phenyl)-1-{6-[4-(4-ethyl-piperazin-1-yl)-phenylamino]-pyrimidin-4-yl}-1-methyl-urea or any pharmaceutically acceptable salt thereof. It further relates to processes of making said solid pharmaceutical dosage forms.