An Open Label Trial of Duloxetine in the Treatment of Irritable Bowel Syndrome and Comorbid Generalized Anxiety Disorder

This study has been completed.
Information provided by (Responsible Party):
Alicia Kaplan, West Penn Allegheny Health System Identifier:
First received: August 17, 2009
Last updated: March 3, 2014
Last verified: March 2014

The investigators propose to evaluate the effectiveness of duloxetine in treating subjects with both Irritable Bowel Syndrome (IBS) and Generalized Anxiety Disorder (GAD). The investigators hypothesize that duloxetine as a single therapeutic agent will effectively target pain and other core symptoms of IBS as well as GAD in this patient population with both conditions.

Condition Intervention Phase
Irritable Bowel Syndrome
Generalized Anxiety Disorder
Drug: Duloxetine
Phase 4

Study Type: Observational [Patient Registry]
Study Design: Time Perspective: Prospective
Target Follow-Up Duration: 12 Weeks
Official Title: An Open Label Trial of Duloxetine in the Treatment of Irritable Bowel Syndrome and Comorbid Generalized Anxiety Disorder

Resource links provided by NLM:

Further study details as provided by West Penn Allegheny Health System:

Primary Outcome Measures:
  • Clinical Global Impression Scale [ Time Frame: weeks -2, 0, 2,4,6,8,12 ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • Hamilton Anxiety Rating Scale [ Time Frame: weeks -2, 0, 2,4,6,8,12 ] [ Designated as safety issue: No ]
  • Irritable Bowel Syndrome-Quality of Life Scale [ Time Frame: weeks -2, 0,4,8,12 ] [ Designated as safety issue: No ]
  • Irritable Bowel Syndrome Severity Scoring System [ Time Frame: weeks -2,0,2,4,6,8,12 ] [ Designated as safety issue: No ]

Enrollment: 17
Study Start Date: September 2009
Study Completion Date: September 2012
Primary Completion Date: September 2012 (Final data collection date for primary outcome measure)
Intervention Details:
    Drug: Duloxetine
    All subjects will receive single-blind placebo for the first two weeks, and then duloxetine for the next 12 weeks, followed by an up to 2 week taper off of the duloxetine. After 2 weeks of placebo daily, subjects will receive 30 mg per day of duloxetine for two weeks, then titrated up to 60 mg per day of duloxetine at week 2. A dosage decrease to 30 mg daily is permittable after week 2. This will be a flexible dose study with doses of duloxetine progressively increasing at weeks 4 (90 mg daily) and 6 (120 mg daily) in conjunction with CGI-I scores, to reach 120 mg daily or the maximum tolerated dose, if less than 120 mg daily at Week 12. There will be a post-taper follow up appointment at Week 14. Of Note: Amendment IRB Approved 6/14/11 Study Ending at Week 12 with removal of Week 14 visit as part of study.
    Other Name: Cymbalta
Detailed Description:

Generalized Anxiety Disorder (GAD) is commonly associated with Irritable Bowel Syndrome(IBS). The etiology of IBS remains unknown and it is often refractory to treatment. Duloxetine has demonstrated efficacy in the treatment of GAD as well as other pain disorders including fibromyalgia and diabetic neuropathy.

We plan to study 30 subjects with diagnoses of IBS and GAD between the ages of 18 and 65 years. There will be a single-blind placebo-run-in for the first 2 weeks, followed by open-label duloxetine for 12 weeks flexibly titrated to 120 mg/day. Subjects will be informed that they will receive placebo for 2 weeks during the trial. All study visits will be at Allegheny General Hospital Department of Psychiatry. The study consists of a total of nine office visits.


Ages Eligible for Study:   18 Years to 65 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population

18-65 years of age Active IBS diagnosis by a gastroenterologist


Inclusion Criteria:

  • 18-65 years of age
  • Active IBS diagnosis by a gastroenterologist
  • Generalized Anxiety Disorder diagnosed by DSM-IV TR criteria and the Mini International Neuropsychiatric Interview for the DSM-IV (Mini)
  • No changes in any non study medication once starting the study

Exclusion Criteria:

  • Current diagnoses of Major Depressive Disorder, Panic Disorder, Social Phobia, Post Traumatic Stress Disorder, Obsessive Compulsive Disorders, Eating Disorders, Somatoform Disorders, Drug or alcohol abuse or dependence, or severe personality disorder
  • Lifetime history of any Bipolar Disorder or Psychotic Disorder
  • Concurrent GI disorders falling outside of Rome III Functional GI disorders
  • Pregnant women or sexually active female subjects not using medically acceptable method of contraception
  • Current suicidal ideation
  • Unstable medical condition
  Contacts and Locations
Please refer to this study by its identifier: NCT00961298

Sponsors and Collaborators
West Penn Allegheny Health System
Principal Investigator: Alicia J Kaplan, MD West Penn Allegheny Health System
  More Information

No publications provided by West Penn Allegheny Health System

Additional publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Alicia Kaplan, MD, West Penn Allegheny Health System Identifier: NCT00961298     History of Changes
Other Study ID Numbers: RC-4656
Study First Received: August 17, 2009
Last Updated: March 3, 2014
Health Authority: United States: Institutional Review Board

Keywords provided by West Penn Allegheny Health System:
Irritable Bowel Syndrome
Generalized Anxiety Disorder

Additional relevant MeSH terms:
Anxiety Disorders
Irritable Bowel Syndrome
Mental Disorders
Colonic Diseases, Functional
Colonic Diseases
Intestinal Diseases
Gastrointestinal Diseases
Digestive System Diseases
Serotonin Uptake Inhibitors
Neurotransmitter Uptake Inhibitors
Neurotransmitter Agents
Molecular Mechanisms of Pharmacological Action
Pharmacologic Actions
Serotonin Agents
Physiological Effects of Drugs
Adrenergic Uptake Inhibitors
Adrenergic Agents
Dopamine Uptake Inhibitors
Dopamine Agents
Antidepressive Agents
Psychotropic Drugs
Central Nervous System Agents
Therapeutic Uses processed this record on April 16, 2014