Screening Herbs for Drug Interactions
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|ClinicalTrials.gov Identifier: NCT00029263|
Recruitment Status : Completed
First Posted : January 10, 2002
Last Update Posted : August 18, 2006
|Condition or disease||Intervention/treatment||Phase|
|Healthy||Drug: herbals||Phase 2|
The use of herbal medicines in the treatment of various medical and psychiatric conditions has accelerated in the last decade. It has also become evident that herbal medications are being used concomitantly with conventional prescription and over-the-counter medications. However, the systematic evaluation of the potential of these agents to interact with conventional medications has been generally neglected. Compounding this problem is the fact that even single entity herbal products can contain a multitude of naturally occurring chemicals which serve as candidates for potential herb-drug interactions by inhibiting or inducing specific hepatic isozymes. Numerous reports document the importance of pharmacokinetic interactions involving inhibition or induction of the cytochrome P450 (CYP) enzyme system. In this study, the ten most commonly used herbal products in the US will be systematically evaluated for inhibition of CYP 3A4 and 2136, and induction of CYP 3A4. Collectively, these enzyme systems are involved in the metabolism of approximately 80% of all marketed medications.
Participants in this study will receive a single dose of the prescription drug alprazolam and the over-the-counter cough suppressant, dextromethorphan on two occasions. A combination of probe drugs will be given to normal volunteers both in the absence and presence of herbal medications. The plasma and urine concentration of these agents and their respective metabolites will be determined in order to evaluate individual herbal products degree and specificity of enzyme inhibitory or inductive effects.
|Study Type :||Interventional (Clinical Trial)|
|Estimated Enrollment :||140 participants|
|Intervention Model:||Single Group Assignment|
|Masking:||None (Open Label)|
|Official Title:||R-21 Project: Screening Herbs for Drug Interference|
|Study Start Date :||August 2001|
|Estimated Study Completion Date :||May 2004|
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): NCT00029263
|United States, South Carolina|
|Institute of Psychiatry, Medical University of SC|
|Charleston, South Carolina, United States, 29425|
|Principal Investigator:||John Markowitz, MD||Medical University of South Carolina|