A 69-year-old woman who had been treated with Otsu-ji-to for fourteen days developed liver dysfunction. She continued to take Otsu-ji-to and was admitted to our hospital due to respiratory failure with extensive ground-glass opacities on chest computed tomography 22 days after starting to take Otsuji-to. Although she developed severe respiratory failure, her condition was improved by discontinuation of Otsu-ji-to and high-dose corticosteroid pulse therapy. The lymphocyte stimulation test was positive for Otsu-ji-to. Finally, we diagnosed drug-induced lung injury due to Otsu-ji-to. As in this case, severe herbal medicine-induced lung injury may be developed secondary to preceding liver injury. When a patient prescribed ou-gon-containing herbal medicines such as Otsu-ji-to develops liver dysfunction, due to herbal medicines containing ou-gon such as Otsu-ji-to, it is important to evaluate lung injury and discontinue the Kampo drug.

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