Colesevelam for the Treatment of Bile Acid Malabsorption in Patients With Crohn's Disease

Inclusion criteria: * Signed informed consent after adequate explanation of the patient information. * Male and female patients with CD and 18 to 65 years of age in clinical remission with a Crohns Disease Activity Index (CDAI) score of 150 or less, with symptoms of functional BAM or symptoms of BAM after small bowel resection with a frequency of at least 3 to maximal 15 liquid or soft stools per day. * Stable medical treatment of CD for a minimal period of 3 months preceding the screening visit, consisting of * either continuous oral treatment of aminosalicylate, prednisolone (a maximum 10 mg/day), azathioprine, 6-mercaptopurine, or methotrexate * or supporting periodic treatment\* with TNF-alpha AK (Infliximab, Adalimumab, Certolizumab) (for patients on TNF-alpha, dosing with TNF-alpha should coincide with baseline visit) * Blood serum CRP value of less or equal then 1 mg/dl (10 mg/l). * BAM assessed with a blood test on a 7α-hydroxy-4-cholesten-3-on excretion of equal or more than 50 ng/ml Exclusion criteria: * Allergy or hypersensitivity to any of the components of cholestagel or placebo as identified from the medical history * Participation at another clinical trial within a period of 4 weeks before the screening visit * Presence of any addiction, alcohol abuse or specific disease that would not allow the patient to understand the essence and requirements and potential consequences of the participation to the clinical trial * Signs suggestive of the patient being unable to follow the visit schedule as required (for example for professional obligations) * Treatment with cyclosporine, or tacrolimus, 3 month or less before screening * Oral Treatment with antibiotics 3 weeks or less before screening * Topical treatment with steroid- or mesalazine-containing applications 3 weeks or less before screening * Treatment with bile acid bile acid binding agent (e.g. Cholestayramine)6 weeks or less before screening * Infectious diseases (HIV, hep B, hep C, tuberculosis, listeriosis, positive clostridium-difficile-toxin- proof in faeces) * Current presence of intra-abdominal abscess or Fistula * Cholestatic liver disease, bowel or biliary obstruction * Dysphagia or swallowing disorders * Known malignancy or history of malignancy * Having undergone intestinal surgery within 6 months from screening * Status after intestinal surgery with more then 100cm of resected bowel. * Short bowel syndrome * Planned -gastrostomy, ileostomy or colostomy. * Pregnancy and lactation