Abstract: The invention relates to a pharmaceutical composition containing the platinum complex of formula (I) as an active substance where A, A?, B, B?, X and X? have specific meanings, in a mixture with at least one pharmaceutically acceptable excipient, characterized in that it is formed of a granulate with particles smaller than 0.5 mm in size prepared by wet granulation of a mixture of platinum complex of tetravalent platinum of formula (I) wetted by water, at least one neutral saccharide and at least one native and/or modified polysaccharide, being optionally contained in a capsule or a sack or being optionally pressed into the form of a tablet, while the surface of the granulate, the capsule or the tablet is optionally coated with a layer of at least one pharmaceutically acceptable substance enabling enterosolvent dissolution of the active substance in bowels only and/or at least one pharmaceutically acceptable substance enabling the controlled release of the active substance.