An oral solid dosage form comprising a mixture of a compound of formula I, a fusible polymeric carrier, and optionally a pharmaceutically acceptable excipient, said mixture being an amorphous dispersion. [Chemical 1]式Iの化合物と、可融性ポリマー担体と、任意に薬学的に許容される賦形剤と、の混合物を含み、前記混合物が非晶質分散体である、経口固体剤形。【化1】