Relationship Between Folic Acid and Warfarin Metabolism and Effect

October 28, 2008 updated by: Hadassah Medical Organization

The Effect of Folic Acid Concentration and Folic Acid Supplementation on Warfarin Pharmacokinetic and Warfarin Dose Requirement at Steady State.

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.

Study Overview

Status

Unknown

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Anticipated)

400

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Israel
      • Jerusalem, Israel
        • Recruiting
        • Hadassah Medical Organization
        • Principal Investigator:
          • Yoseph Caraco, MD

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Patients on chronic warfarin therapy

Exclusion Criteria:

  • Refusal to participate in the study

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Warfarin pharmacokinetic prior to and following administration of folic acid
Warfarin dose requirement prior to and following the administration of folic acid.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Hadassah Medical Organization

Investigators

  • Principal Investigator: Yoseph Caraco, MD, Hadassah Medical Organization

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

August 1, 2001

Study Registration Dates

First Submitted

September 11, 2005

First Submitted That Met QC Criteria

September 11, 2005

First Posted (Estimate)

September 13, 2005

Study Record Updates

Last Update Posted (Estimate)

October 29, 2008

Last Update Submitted That Met QC Criteria

October 28, 2008

Last Verified

October 1, 2008

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • yc19552-HMO-CTIL

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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