Efficacy, Safety and Tolerability of Enteric-Coated Cholestyramine Capsules for Adult Short Bowel Syndrome

Inclusion Criteria: 1. Adult, ambulatory male and female subjects 2. Provision of signed and dated informed consent form (ICF) 3. Age ≥ 18 years and ≤ 80 years 4. Stable SBS of: 1. Non-surgical origin; OR 2. Surgical origin where the last surgical ileal resection was performed at least 6 months prior to enrolment 5. Partial, Home Parenteral Nutrition and/or parenteral fluids are allowed, at a maximum frequency of 6 times a week throughout the trial, as long as the regimen has been stable for at least 2 weeks prior to screening and is expected to remain unchanged during the study 6. At least 50 % of the colon being intact 7. Intact duodenum 8. BMI ≥ 18 9. Presence of stable chronic diarrhea for at least 3 months prior to enrolment as evidenced by medical history 10. Presence of stable chronic diarrhea during the 2-week screening diary period before randomization, as evidenced by completion of a screening diary demonstrating: 1. Mean daily production of at least 3 soft or watery stools (BSFS scores 6 or 7); or 2. More than 3 bowel movements per day on average with \>25% of them being BSFS type 6 or 7 11. Stated willingness and ability to comply with all study procedures, including daily recording of bowel movements and BSFS in the patient diaries, and availability for the duration of the study 12. Clinical laboratory values within the laboratory's stated normal range; if not within this range, they must be without clinical significance, as determined by the investigator 13. Female subjects must meet one of the following criteria: a) Participant is of childbearing potential and agrees to use one of the accepted contraceptive regimens from at least 30 days prior to the first study treatment administration through to at least 30 days after the last dose of the study treatment. An acceptable method of contraception includes one of the following: 1. Abstinence from heterosexual intercourse 2. Systemic contraceptives (combined birth control pills, injectable/implant/insertable hormonal birth control products, transdermal patch) 3. Intrauterine device (with or without hormones) 4. Condom with spermicide b) Participants of non-childbearing potential, defined as surgically sterile (i.e. has undergone complete hysterectomy or bilateral oophorectomy) or is in a menopausal state (i.e. at least 1 year without menses prior to the first study drug administration) are eligible Exclusion Criteria: 1. Patients with known or suspected intestinal strictures of clinical relevance as judged by the Investigator 2. Active inflammatory bowel disease (IBD) or fistula during the screening period as judged by the Investigator 3. Crohn's disease patients not being in clinical remission for the last 12 weeks prior to randomization 4. Diarrhea caused by other causes than SBS 5. Presence of clinically significant steatorrhea, requiring pancreatic enzymes supplementation 6. Presence of complete biliary obstruction 7. Presence of active cancer (except resected cutaneous basal or squamous cell carcinoma and except in situ cervical cancer) and/or need to receive chemotherapy or radiotherapy during the study 8. History of allergic reaction to cholestyramine or any excipient of the investigational drug product or placebo, or packaging components 9. Females who are lactating at screening 10. Females who are pregnant according to the pregnancy test at screening or prior to the first study treatment administration 11. Significant history (at least 3 consecutive months in the year prior to Screening) of drug dependency or alcohol abuse (\> 3 units of alcohol per day, intake of excessive alcohol, acute or chronic) 12. Subjects who took an Investigational Product (IP) in the 30 days prior to the first study drug administration 13. Any other clinically significant condition that is considered by the principal investigator as being susceptible to put the patient at greater safety risk, influence response to study product, or interfere with study assessments.