A pharmaceutical composition for treating IL-6-related diseases having as an active ingredient an IL-6 inhibitor, wherein the pharmaceutical composition is administered as usual after a short-interval dosing period where the same dose as the usual dose is administered at a shorter interval than the usual dosing interval.本發明之醫藥組成物係以IL-6抑制劑作為有效成份之用於治療IL-6相關疾病的醫藥組成物,歷經以與通常投藥量相同的投藥量且以較通常投藥間隔為更短的間隔投藥之短間隔投藥期間後,進行通常投藥為其特徵。