- Gastrointestinal abnormalities including: Inability to take oral medication; Requirement for intravenous alimentation; Prior surgical procedures affecting absorption including total gastric resection; Treatment for active peptic ulcer disease in the past 6 months; Active gastrointestinal bleeding as evidenced by hematemesis, hematochezia or melena in the past 3 months without evidence of resolution documented by endoscopy or colonoscopy; Malabsorption syndromes.