2. Patients with the following conditions (i) Patients with a history of lactic acidosis (ii) Dialysis patients (including peritoneal dialysis) (iii) Patients with cardiovascular conditions such as shock, cardiac insufficiency, myocardial infarction, and pulmonary embolism; patients with severely impaired pulmonary function; and patients with other conditions fostering susceptibility to hypoxemia (iv) Patients with excessive alcohol consumption (v) Patients with dehydration (vi) Patients with gastrointestinal disorders such as diarrhea and vomiting (vii) Elderly patients