Abstract: Objective: We report the case of a 47-year-old man with depression who developed acute dyspnea, hypoxemia, and mild hemoptysis after electroconvulsive therapy (ECT).Method: Intravenous carbazochrome sodium sulfate hydrate as a hemostatic drug (100 mg/day) was prescribed for 2 days. On the day of ECT, oxygen inhalation (4 L/min) was continued, and SpO2 was maintained at 94–96%.Results: Chest radiography showed improvement in alveolar infiltration. Chest CT 6 days after ECT also confirmed the disappearance of ground glass opacities in the lung fields.Conclusion(s): NPE is lifethreatening and should be recognized as an uncommon adverse event associated with ECT.