Study of Antibiotics in the Treatment of Colonic Crohn's Disease

Inclusion Criteria: Patients who are 16 years of age or older. Patients who have been diagnosed with Crohn's disease for more than 1 month. Patients with CDAI scores between 220 and 450 at the randomization visit. Patients with Crohn's disease involving any portion of the colon (more than erythema and/or 10 aphthoid ulcers) with or without distal or terminal ileal disease. (Subjects may have had previous partial colonic resection consisting of less than 50% of the estimated length of the colon.) Exclusion Criteria: Female patients who are, or may become, pregnant during the course of the study or women who are breastfeeding. Patients who have an allergy or contraindication to ciprofloxacin or to metronidazole. Patients who are experiencing a complication of Crohn's disease (e.g. perforation, acute obstruction, hemorrhage) requiring urgent surgical intervention. Patients with subacute small bowel obstruction. Patients with significant, symptomatic Crohn's disease of the esophagus, the stomach, the duodenum, or the jejunum. Patients who have received, i)any antibiotic within 2 weeks of the screening visit, ii)systemic corticosteroid therapy within 2 weeks of the screening visit, iii)parenteral nutritional therapy within 2 weeks of the screening visit, iv)enteral elemental or polymeric nutritional therapy or exclusively liquid diet within 2 weeks of the screening visit, v) infliximab within 12 weeks of the screening visit, vi)an initiation of therapy with sulphasalazine or with any 5-ASA preparation within 4 weeks of the screening visit or a change in the dose within 2 weeks of the screening visit (Patients on stable doses of sulphasalazine or of a 5-ASA preparation for at least 2 weeks prior to the screening visit are eligible for entry into the study if the total duration of the therapy is at least 4 weeks prior to screening.), vii)an initiation of azathioprine, 6-MP, or methotrexate within 12 weeks of the screening visit or changes in the dose of azathioprine, of 6-MP, or of methotrexate within 4 weeks of screening visit (Patients receiving azathioprine, 6-MP, or methotrexate for at least 12 weeks and at a stable dose for at least 4 weeks prior to the screening visit are eligible for inclusion.), viii)other therapy not listed above for Crohn's disease within 4 weeks of the screening visit, AND/OR ix)any investigational drug within 12 weeks of the screening visit. Patients whose stool culture tests positive for enteric pathogens at the screening visit. Patients whose stool assay is positive for Clostridium difficile toxin at the screening visit. Patients who have another clinically significant medical or psychiatric illness (as judged by the investigator). Patients who have had a resection of more than 100 cm of their small intestine, more than half of their colon, or who have an ileostomy. Patients who are unable to provide informed consent.