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Relationship Between Folic Acid and Warfarin Metabolism and Effect

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified October 2008 by Hadassah Medical Organization.
Recruitment status was:  Recruiting
Sponsor:
ClinicalTrials.gov Identifier:
NCT00162409
First Posted: September 13, 2005
Last Update Posted: October 29, 2008
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by:
Hadassah Medical Organization
  Purpose

Folic acid supplementation has been shown previously to be associated with enhanced formation of p-HPPH from phenytoin, a metabolic pathway which is predominantly mediated through the activity of CYP2C9.

The metabolism of S warfarin, the more active enantiomer of warfarin, is also mediated predominantly through the activity of CYP2C9.

The purpose of the present study was to examine the relationship between folic acid concentration and warfarin pharmacokinetic as well as warfarin dose requirement among patients treated by warfarin. In addition the effect of folic acid supplementation (5 mg/d) for 3 weeks on warfarin pharmacokinetic and warfarin dose requirement will be evaluated in the second part of the study.


Condition Intervention
Folic Acid Deficiency Drug: Folic acid

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: The Effect of Folic Acid Concentration and Folic Acid Supplementation on Warfarin Pharmacokinetic and Warfarin Dose Requirement at Steady State.

Resource links provided by NLM:


Further study details as provided by Hadassah Medical Organization:

Primary Outcome Measures:
  • Warfarin pharmacokinetic prior to and following administration of folic acid
  • Warfarin dose requirement prior to and following the administration of folic acid.

Estimated Enrollment: 400
Study Start Date: August 2001
  Eligibility

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  • Patients on chronic warfarin therapy

Exclusion Criteria:

  • Refusal to participate in the study
  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00162409


Contacts
Contact: Yoseph Caraco, MD 00 972 2 6778584 caraco@hadassah.org.il

Locations
Israel
Hadassah Medical Organization Recruiting
Jerusalem, Israel
Contact: Arik Tzukert, DMD    00 972 2 6776095    arik@hadassah.org.il   
Contact: Hadas Lemberg, PhD    00 972 2 6777572    lhadas@hadassah.org.il   
Principal Investigator: Yoseph Caraco, MD         
Sponsors and Collaborators
Hadassah Medical Organization
Investigators
Principal Investigator: Yoseph Caraco, MD Hadassah Medical Organization
  More Information

ClinicalTrials.gov Identifier: NCT00162409     History of Changes
Other Study ID Numbers: yc19552-HMO-CTIL
First Submitted: September 11, 2005
First Posted: September 13, 2005
Last Update Posted: October 29, 2008
Last Verified: October 2008

Additional relevant MeSH terms:
Folic Acid Deficiency
Vitamin B Deficiency
Avitaminosis
Deficiency Diseases
Malnutrition
Nutrition Disorders
Warfarin
Folic Acid
Vitamin B Complex
Anticoagulants
Hematinics
Vitamins
Micronutrients
Growth Substances
Physiological Effects of Drugs