The plant Korean rosebay are members of the Ericaceae(Heath) family and may contain grayanotoxins, which exert toxic effects by binding to sodium channels in cell membranes. We had experience of 2 cases of Korean rosebay intoxication, who exposed to Rhododendron mucronulatum. Patients were presented to our ED with nausea and vomiting, hypotension, and dizziness or depressed mentation. The patients were performed monitoring and supportive treatment and were fully recovered within 48hours. Korean rosebay intoxication should be considered in patients with clinical evidence of gastrointestinal irritation, cardiac arrhythmias, and/or neurologic signs without identifiable causes, especially in spring or early summer.