Suspended

Early Identification of Adverse Reactions to Herbs

0 criteria met from your profileSee at a glance how your profile meets each eligibility criteria.
What is being collected

Data Collection

Collected from today forward - Prospective
Who is being recruted

Blood Coagulation Disorders+3

+ Cardiovascular Diseases

+ Hematologic Diseases

Over 18 Years
See all eligibility criteria
How is the trial designed

Observational
Study Start: October 2007
See protocol details

Summary

Principal SponsorUniversity of California, San Francisco
Last updated: January 18, 2026
Sourced from a government-validated database.Claim as a partner

Study start date: October 1, 2007

Actual date on which the first participant was enrolled.

The purpose of this study is to determine if the use of herbal products interferes with normal anticoagulation, leading to either excessive thinning of the blood and bleeding problems or inadequate thinning of the blood and clotting problems. Many patients who are on long term anticoagulation, or blood thinning, for a variety of medical problems, also take herbal products. It is not yet known whether use of herbal products interferes with this anticoagulation, and puts patients at risk for bleeding or clotting. This study will carefully monitor patients who are taking herbs and anticoagulants to determine if their laboratory tests show signs of being affected by the herbs. The study will ask all patients about their herbal product use, so all reported herbs will be included and monitored.

Official TitleEarly Identification of Adverse Reactions to Herbs 
NCT00071682
Principal SponsorUniversity of California, San Francisco
Last updated: January 18, 2026
Sourced from a government-validated database.Claim as a partner

Protocol

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

Eligibility

Researchers look for people who fit a certain description, called eligibility criteria: person's general health condition or prior treatments.
Conditions
Criteria

Any sex

Biological sex of participants that are eligible to enroll.

Over 18 Years

Range of ages for which participants are eligible to join.

Healthy volunteers allowed

If individuals who are healthy and do not have the condition being studied can participate.

Conditions

Pathology

Blood Coagulation DisordersCardiovascular DiseasesHematologic DiseasesHemorrhagic DisordersVascular DiseasesHemostatic Disorders

Criteria

Inclusion criteria: * Taking longer-term (\>6 months) anticoagulation * Enrolled in one of Kaiser Permanente Northern California anticoagulation clinics

Study Centers

These are the hospitals, clinics, or research facilities where the trial is being conducted. You can find the location closest to you and its status.

This study has 1 location

Suspended

San Francisco VA Medical Center

San Francisco, United StatesSee the location
SuspendedOne Study Center