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Pharmacokinetics of Immediate-Release vs. Delayed-Release Omeprazole in Gastroparesis

This study has been completed.
Valeant Pharmaceuticals International, Inc.
Information provided by (Responsible Party):
University of Louisville Identifier:
First received: June 26, 2007
Last updated: September 21, 2011
Last verified: August 2011
The purpose of this study is to compare the blood drug levels of two prescribed medications, immediate-release omeprazole 40 mg powder and delayed-release omeprazole 40 mg capsule to determine which drug is better absorbed in patients with a slow stomach emptying (gastroparesis). Delayed-release omeprazole has a protective coating to prevent the drug omeprazole from being neutralized by stomach acid. Immediate-release omeprazole has sodium bicarbonate (antacid) which neutralizes the stomach acid, eliminating the need for a protective coating. Immediate-release omeprazole suspension may have a more rapid pharmacokinetic profile and greater overall drug absorption in gastroparesis.

Condition Intervention Phase
Gastroparesis Gastroesophageal Reflux Disease Drug: Immediate-release omeprazole Drug: Delayed-release omeprazole Phase 4

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Pharmacokinetics of Immediate-Release vs. Delayed-Release Omeprazole in Patients With Heartburn Associated With Gastroparesis

Resource links provided by NLM:

Further study details as provided by University of Louisville:

Primary Outcome Measures:
  • Pharmacokinetics of immediate-release omeprazole vs. delayed release omeprazole when administered 60 min prior to a standardized fatty breakfast: 1) time to max concentration, 2) max concentration, 3) area-under-curve [ Time Frame: 7 days ]

Estimated Enrollment: 15
Study Start Date: June 2007
Study Completion Date: December 2008
Primary Completion Date: December 2008 (Final data collection date for primary outcome measure)
Intervention Details:
    Drug: Immediate-release omeprazole
    Immediate-release omeprazole 40 mg qam for 7 days
    Drug: Delayed-release omeprazole
    Delayed-release omeprazole 40 mg qam for 7 days
Detailed Description:

Hypothesis: Immediate-release omeprazole suspension may have a more rapid pharmacokinetic profile and greater overall drug absorption in gastroparesis. This will result in shorter time to maximal drug concentration, greater maximal concentration, and greater total area under the curve of the concentration vs. time plot.

Primary Objective: To compare the pharmacokinetics of omeprazole between immediate-release suspension and delayed-release capsules in patients with heartburn associated with gastroparesis.

Study design: randomized, open-labeled, crossover treatment for 7 days with 10-14 days washout. Pharmacokinetic studies will be performed after 7 days on study drug.


Ages Eligible for Study:   18 Years to 80 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Symptoms of heartburn >2 days per week off antireflux therapy, defined by "a burning feeling rising from the stomach or lower chest up towards the neck"
  • Symptoms of gastroparesis >1 month in duration, defined by nausea, vomiting, bloating, dyspepsia, early satiety, or effortless regurgitation.
  • Prior abnormal 4-hour gastric emptying scan within the past 3 years

Exclusion Criteria:

  • History of esophageal or gastric surgery
  • Severe gastroparesis with any of the following: vomiting with dehydration requiring IV hydration, hospitalization, weight loss >10 % pre-illness weight, requiring feeding jejunostomy tubes
  • Presence of gastric electrical stimulator
  • Symptoms of retching with vomiting more than 2 days per week
  • Diagnosis of diabetes
  • Disorders of small bowel motility (such as pseudo-obstruction or dumping syndrome)
  • Disorders of small bowel absorption
  • Diagnosis of gastric outlet, small bowel or colon mechanical obstruction
  • Diagnosis of acid hypersecretory syndrome
  • Disorders affecting proton pump inhibitor metabolism (such as liver failure)
  • Known allergy or side effects to proton pump inhibitor
  • Non-ambulatory patients: bed-ridden, nursing home resident, etc.
  • Pregnancy
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00492622

United States, Kentucky
Digestive Health Center, University of Louisville Hospital
Louisville, Kentucky, United States, 40202
Sponsors and Collaborators
University of Louisville
Valeant Pharmaceuticals International, Inc.
Principal Investigator: John M Wo, MD University of Louisville
  More Information

Responsible Party: University of Louisville Identifier: NCT00492622     History of Changes
Other Study ID Numbers: 014.07
Study First Received: June 26, 2007
Last Updated: September 21, 2011

Keywords provided by University of Louisville:
Gastroesophageal reflux disease

Additional relevant MeSH terms:
Gastroesophageal Reflux
Esophageal Motility Disorders
Deglutition Disorders
Esophageal Diseases
Gastrointestinal Diseases
Digestive System Diseases
Stomach Diseases
Neurologic Manifestations
Signs and Symptoms
Anti-Ulcer Agents
Gastrointestinal Agents
Proton Pump Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action processed this record on June 28, 2017