The Efficacy of Tradition Chinese Medicine in Patients With Irritable Bowel Syndrome (TCM-IBS)

The Chinese University of Hong Kong

Status and phase

Completed

Phase 2

Conditions

Irritable Bowel Syndrome

Treatments

Drug: Traditional Chinese Medicine

Drug: Traditional Chinese Medicine Placebo

Study type

Interventional

Funder types

Other

NIH

Identifiers

NCT00676975

TCM-IBS

1U19AT003266-01 (U.S. NIH Grant/Contract)

Details and patient eligibility

About

To test the efficacy of Traditional Chinese Medicine in relieving symptoms and change of quality of life of patients with Irritable Bowel Syndrome.

Full description

Irritable bowel syndrome (IBS), characterized by abdominal pain/discomfort and disturbed bowel frequency, is a common functional bowel disorder that accounts for a substantial proportion of patients seen in primary care and secondary referral centers. The impact on patients' quality of life and the economic burden on the community are considerable. However, the outcome of conventional Western medicine in treating IBS has been disappointing. Several potential new therapeutic agents have been withdrawn because of serious adverse events. Traditional Chinese medicine (TCM) has been used in the treatment of IBS for centuries in Asian countries but scientific evaluation of its therapeutic function is scarce. A methodologically strong trial of a 20-herb formula has shown significant benefit for IBS patients. However, the herbal formulation was inadequately characterized and defined for repeated clinical studies.

Subsequent to complete chemical characterization, a randomized, placebo-controlled, double-blind, phase II dose-escalation clinical trial will be conducted to find an optimally safe and efficacious dosage of this standardized 20-herb preparation in 104 patients aged 18 to 75 with all types of IBS. At each of two dosage levels, 52 participants will be randomized to treatment for 8 weeks with the herbal formula or placebo in a 1:1 allocation ratio, and will be assessed at baseline, weeks 0, 2, 4, 8, and 12 for the clinically important and reliable outcome of patient reported global symptom improvement. At the conclusion of the 1st dosage level, safety will be assessed prior to using the higher dosage in a new cohort of participants. We also will assess individual IBS symptoms, nature, severity, duration, and frequency of adverse events, quality of life, concurrent IBS medications and health care utilization, and will perform blood tests for safety purposes. Adherence to study medication will be verified by dose counts. Results of this dose-ranging study will help to identify the optimal dosage of the herbal formula to be used in future randomized placebo-controlled trials and in head-to-head comparisons with conventional pharmaceuticals.

Enrollment

104 patients

Sex

All

Ages

18 to 65 years old

Volunteers

Accepts Healthy Volunteers

Inclusion criteria

All IBS patients attending the Gastroenterology Clinic of the Prince of Wales Hospital of Hong Kong.
Age 18-75 inclusive
IBS diagnosed by Rome III criteria:
- Recurrent abdominal pain or discomfort at least three days per month in the previous three months
- Symptom onset at least six months prior to diagnosis
- Pain or discomfort associated with two or more of the following:
  1. Improvement with defecation
  2. Onset associated with a change in frequency of stool
  3. Onset associated with a change in form (appearance) of stool
Normal colonic evaluation (colonoscopy or barium enema) in past 5 years
No "global symptom improvement" as rated by patients (see below) at baseline and during the two-week run-in period
Normal full blood count, liver function test and renal function test.
Informed written consent for participation into study.
Ethical approval will be obtained from the Joint CUHK-NTEC Clinical Research Ethics Committee as well as the IRB of UMB.

Exclusion criteria

Past or present history of organic disease of gastrointestinal tract (e.g. colorectal cancer, advanced colonic polyp, celiac disease, inflammatory bowel disease, peptic ulcer and previous gastrointestinal surgery). (Note: those with polyps removed during colonoscopy can be included, as long as no known polyps remained).
Systemic diseases that cause diarrhea or constipation (e.g. thyroid disease, diabetic neuropathy)
Lactose intolerance
Severe liver diseases (e.g. cirrhosis, chronic active hepatitis)
Renal impairment (serum creatinine level > 150mmol/L)
Women who are pregnant, lactating or not practicing proper contraception
Known hypersensitivity to herbal medicine
Concommitant use of prescription antidepressant medication.
Current alcoholism and drug abuse
Current psychiatric illness or dementia
Fever or severe illness at baseline (week 0).