Subject of the present invention are compositions comprising a mixture of calcium, magnesium and iron salts for use as a pharmaceutical preparation for adsorbing phosphate, especially for use as pharmaceutical preparations for the treatment of hyperphosphataemia, chronic kidney deficiency as well as for the treatment of haemodialysis patients.本發明之主旨為包含鈣、鎂及鐵鹽之混合物之組成物其係用作為吸附磷酸鹽之藥學製劑,特別係用作為高磷血症、慢性腎功能不全以及血液透析病人治療用之藥學製劑。