PROBLEM TO BE SOLVED: To provide a solid dosage formulation for providing controlled-release of a pharmacological agent.SOLUTION: There is provided a solid dosage formulation having: a core tablet with a pharmacological agent dispersed in a first controlled-release matrix from which release of the agent is relatively slow and a coating formed and covering the core tablet and containing tramadol dispersed in a second controlled-release matrix from which release of the tramadol is relatively fast.COPYRIGHT: (C)2011,JPO&INPIT【課題】薬物の放出制御を提供する固形投与製剤を提供すること。【解決手段】第1の放出制御基剤中に分散された薬物を含み、そこからの薬物の基剤放出が相対的に遅い中心錠、および前記中心錠を覆って形成され、かつ第2の放出制御基剤中に分散されたトラマドールを含み、そこからのトラマドールの放出速度が相対的に速いコーティングを含む固形投与製剤。【選択図】 図1