- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00011063
Effect of Ginkgo Biloba on Phenytoin Elimination
Evaluation of the Effect of Ginkgo Biloba on Phenytoin Pharmacokinetics
This study will examine how the herbal remedy ginkgo biloba may affect the body's elimination of other medicines. Many people take ginkgo biloba to improve memory, mental alertness and overall feeling of well being. Since this product is considered a food supplement and not a drug, it is not subject to the rigorous pre-market testing required for prescription and over-the-counter (OTC) drugs. As a result, information has not been collected on possible interactions between ginkgo biloba and other medications. This study will look at how ginkgo biloba affects the elimination of phenytoin-a medication used to treat patients with seizures.
Normal healthy volunteers 21 years of age or older may be eligible for this 40-day study. Candidates will provide a medical history and undergo a physical examination and routine blood tests. Women of childbearing age must use a reliable form of birth control other than oral contraceptives ("the pill").
For at least 2 weeks before the study and throughout its duration, study participants may not have any of the following: 1) medications that can affect platelet function (e.g., aspirin, Motrin, Advil, Nuprin, ibuprofen, etc.); 2) alcoholic beverages; 3) grapefruit and grapefruit juice; and 4) all medications except those given by study personnel.
On day 1 of the study, subjects take one 500-mg dose of phenytoin at 8:00 A.M.. On an empty stomach. (Subjects fast the night before taking the phenytoin and are allowed to eat breakfast 2 hours after the dose). Blood samples are drawn just before dosing and again at 0.5, 1, 1.5, 2, 4, 6, 8, 10, 12, 24, 32, 48, 72 and 96 hours after the dose. Blood drawn on this first study day is collected through a catheter (small plastic tube) placed in a vein to avoid multiple needlesticks. After the 12-hour sample is collected, the subject goes home and then returns to the clinic for the remaining blood draws, which are taken by direct needlestick.
When the blood sampling is completed, subjects begin ginkgo therapy. The NIH Clinical Center provides participants a supply of 60-mg capsules of ginkgo to take twice a day (at 8 A.M. and 8 P.M..) for 4 weeks. At the end of the 4 weeks, subjects are given a second dose of phenytoin as described above and repeat the blood sampling procedure. Subjects continue taking ginkgo during this second phenytoin study.
Study Overview
Detailed Description
Study Type
Enrollment
Phase
- Phase 1
Contacts and Locations
Study Locations
-
-
Maryland
-
Bethesda, Maryland, United States, 20892
- Warren G. Magnuson Clinical Center (CC)
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
- Child
- Adult
- Older Adult
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Male or female.
Healthy by medical history and physical exam.
Age greater than 21 years old.
No concurrent medications.
Non-smoker (for at least 6 months if prior history of smoking).
Laboratory values wihin the following guidelines: AST/SGOT less than or equal to 1.5 times the upper limit of normal; bilirubin less than or equal to the upper limit of normal; serum creatinine less than or equal to the upper limit of normal; hemoglobin greater than or equal to 10 g/dl; albumin NML.
Females of childbearing potential must be using a reliable form of birth control other than hormonal contraceptives.
No concomitant therapy with other inhibitors or inducers of cytochrome P-450 mediated drug metabolism within 30 days of study.
Must have the ability to remain free of chronic medications and alcohol for at least 2 weeks prior to and during the study.
No use of oral contraceptives (phenytoin, and potentially ginko, may induce the clearance of oral contraceptive lead to potential oral contraceptive failure).
Must have the ability and willingness to avoid analgesics with antiplatelet activity for at least 2 weeks prior to and during the study.
No presence of renal, hepatic, cardiovascular, hematologic, neurologic, psychiatric, or respiratory disease or any other condition that may interfere with the interpretation of the study results or not be in the best interests of the subject in the opinion of the principal investigator.
No positive serum pregnancy test.
No presence of persistent diarrhea or malabsorption that would interfere with the patient's ability to adequately absorb drugs.
No drug or alcohol use that may impair safety or adherence.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
Collaborators and Investigators
Publications and helpful links
General Publications
- Eisenberg DM, Davis RB, Ettner SL, Appel S, Wilkey S, Van Rompay M, Kessler RC. Trends in alternative medicine use in the United States, 1990-1997: results of a follow-up national survey. JAMA. 1998 Nov 11;280(18):1569-75. doi: 10.1001/jama.280.18.1569.
- Israel D, Youngkin EQ. Herbal therapies for perimenopausal and menopausal complaints. Pharmacotherapy. 1997 Sep-Oct;17(5):970-84.
- Elion RA, Cohen C. Complementary medicine and HIV infection. Prim Care. 1997 Dec;24(4):905-19. doi: 10.1016/s0095-4543(05)70316-x.
Study record dates
Study Major Dates
Study Start
Study Completion
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Other Study ID Numbers
- 010080
- 01-CC-0080
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.
Clinical Trials on Healthy
-
Prevent Age Resort "Pervaya Liniya"RecruitingHealthy Aging | Healthy Diet | Healthy LifestyleRussian Federation
-
Maastricht University Medical CenterCompletedHealthy Volunteers | Healthy Subjects | Healthy AdultsNetherlands
-
Yale UniversityNot yet recruitingHealth-related Benefits of Introducing Table Olives Into the Diet of Young Adults: Olives For HealthHealthy Diet | Healthy Lifestyle | Healthy Nutrition | CholesterolUnited States
-
Hasselt UniversityRecruitingHealthy | Healthy AgingBelgium
-
Galera Therapeutics, Inc.Syneos HealthCompleted
-
Galera Therapeutics, Inc.Syneos HealthCompletedHealthy | Healthy VolunteersAustralia
-
University of PennsylvaniaActive, not recruitingHealthy | Healthy AgingUnited States
-
Chalmers University of TechnologyGöteborg UniversityCompletedHealthy | Nutrition, HealthySweden
-
University of ManitobaNot yet recruitingHealthy | Healthy Diet
Clinical Trials on Ginkgo Biloba
-
EMSWithdrawn
-
VSM Geneesmiddelen b.v.CompletedRaynaud DiseaseNetherlands
-
The First Affiliated Hospital with Nanjing Medical...Unknown
-
National Center for Complementary and Integrative...National Heart, Lung, and Blood Institute (NHLBI); National Institute of Neurological... and other collaboratorsCompleted
-
Taipei Veterans General Hospital, TaiwanUnknownCoronary Artery Disease | Type 2 Diabetes MellitusTaiwan
-
Milsing d.o.o.CompletedMild Cognitive Impairment | Cerebrovascular InsufficiencyCroatia
-
Maisonneuve-Rosemont HospitalCompleted
-
Dongzhimen Hospital, BeijingCompletedMild Cognitive Impairment | Herbal Medicine AllergyChina
-
Medical University of South CarolinaNational Center for Complementary and Integrative Health (NCCIH)TerminatedMemory, Short-TermUnited States
-
Wanbangde Pharmaceutical Group Co., LTDThe First Affiliated Hospital, Guangzhou University of Traditional Chinese...UnknownStable Angina Pectoris Associated With DepressionChina