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Relationship Between Folic Acid and Warfarin Metabolism and Effect

The recruitment status of this study is unknown because the information has not been verified recently.
Verified October 2008 by Hadassah Medical Organization.
Recruitment status was  Recruiting
Information provided by:
Hadassah Medical Organization Identifier:
First received: September 11, 2005
Last updated: October 28, 2008
Last verified: October 2008

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
Endpoint Classification: Pharmacokinetics/Dynamics Study
Intervention Model: Single Group Assignment
Masking: 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

Ages Eligible for Study:   18 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Patients on chronic warfarin therapy

Exclusion Criteria:

  • Refusal to participate in the study
  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: NCT00162409

Contact: Yoseph Caraco, MD 00 972 2 6778584

Hadassah Medical Organization Recruiting
Jerusalem, Israel
Contact: Arik Tzukert, DMD    00 972 2 6776095   
Contact: Hadas Lemberg, PhD    00 972 2 6777572   
Principal Investigator: Yoseph Caraco, MD         
Sponsors and Collaborators
Hadassah Medical Organization
Principal Investigator: Yoseph Caraco, MD Hadassah Medical Organization
  More Information

No publications provided Identifier: NCT00162409     History of Changes
Other Study ID Numbers: yc19552-HMO-CTIL
Study First Received: September 11, 2005
Last Updated: October 28, 2008
Health Authority: Israel: Israeli Health Ministry Pharmaceutical Administration

Additional relevant MeSH terms:
Folic Acid Deficiency
Deficiency Diseases
Nutrition Disorders
Vitamin B Deficiency
Folic Acid
Vitamin B Complex
Growth Substances
Hematologic Agents
Pharmacologic Actions
Physiological Effects of Drugs
Therapeutic Uses
Vitamins processed this record on October 02, 2015