PROBLEM TO BE SOLVED: To provide an injection dosage form of the aqueous solution containing amiodarone which is a stable, transparent, and immediately administratable class III anti-arrhythmic drug without containing solubilizers, such as a surfactant (for example: polysorbate 80) and a complexing agent (for example: cyclodextrin).SOLUTION: The invention provides an injection dosage form containing a. amiodarone represented by the following formula, or a pharmacologically acceptable salt thereof; b. acid; and c. an aqueous solution containing polyol; and filled up in a plastic container. The solution has a pH of about 2.0-4.0, and contains no solubilizer.SELECTED DRAWING: None【課題】界面活性剤(例:ポリソルベート80)や錯化剤(例:シクロデキストリン)等の可溶化剤を配合しなくても、安定で透明かつ直ちに投与可能なクラスIII抗不整脈薬であるアミオダロン含有水溶液の注射剤形の提供。【解決手段】a.下式で表されるアミオダロン又は薬理学的に許容されるその塩;b.酸;及びc.ポリオールを含有する水溶液を含み、プラスチック容器に充填された注射剤形であって、前記溶液がpH約2.0~4.0であり、可溶化剤を含有しない注射剤形。【選択図】なし