[A case of drug-induced pneumonitis due to Sai-rei-to].

The patient was given Sai-rei-to, adenosine triphosphate disodium and Mecobalamin on a diagnosis of sudden deafness. Forty days later, exertional dyspnea and cough appeared. He was given a diagnosis of bacterial pneumonia and was treated with several antibiotics. His respiratory state gradually worsened and he was refered to our hospital. His chest computed tomography scan showed ground-glass opacity, with consolidation, and laboratory data showed high values of white blood cell and liver dysfunction. After halting all medicines, he recovered. Because the lymphocyte stimulation test was positive for Sai-rei-to and he was still well after taking adenosine triphosphate disodium and Mecobalamin, we diagnosed drug-induced pneumonitis caused by Sai-rei-to.