Interaction between herbal remedies (danshen and baizhi) and caffeine

ISRCTN ISRCTN83028296
DOI https://doi.org/10.1186/ISRCTN83028296
Secondary identifying numbers KAIMRC ZE-001
Submission date
10/06/2019
Registration date
11/06/2019
Last edited
19/07/2023
Recruitment status
No longer recruiting
Overall study status
Completed
Condition category
Other
Prospectively registered
Protocol
Statistical analysis plan
Results
Individual participant data

Plain English summary of protocol

Background and study aims
Chemicals known as furanocoumarins (8-methoxypsoralen [8-MOP] and 5-methoxypsoralen [5-MOP]) are known to inhibit the breakdown (metabolism) of caffeine. However, it is not known if ingestion of herbs containing these chemicals will have the same effect. The aim of this study is to determine if a single meal of furanocoumarin-containing herb (or vegetable) would cause inhibition of caffeine metabolism after co-administration.

Who can participate?
Healthy volunteers aged 20 - 35 years (non-smoker, not pregnant or breastfeeding).

What does the study involve?
Collection of timed saliva and urine samples from you after ingesting caffeine tablets (200 mg) alone and caffeine tablets (200 mg) with an herb (or vegetable) together (total caffeine consumption by you is 400 mg for the whole study).

What are the possible benefits and risks of participating?
BENEFITS:
You will not benefit directly from this study. No information or results obtained by this study will be made available to you. However, there is the potential to benefit other people in the future if the study leads to the development of an effective method for predicting caffeine/herb interaction using in vitro data.
RISKS:
There will be no risk to your health because the amount of caffeine ingested is equivalent that in a cup of coffee. Moreover, the herbs (or foods) selected for the study are found in our daily diets. Please note that caffeine overdose only occurs when large amount of caffeine (more than the recommended dose by Health Canada) is ingested. Caffeine overdose may result in adverse health effects including nausea, vomiting, irritability, nervousness, anxiety, panic attacks, dehydration, and sleep disorders in sensitive individuals (Health Canada, 2012).

Where is the study run from?
Department of Biological Sciences, Simon Fraser University, BC, Canada

When is the study starting and how long is it expected to run for?
June 2012 to June 2016

Who is funding the study?
1. Simon Fraser University, Canada
2. Global Collaborative Research, King Abdullah University of Science and Technology

Who is the main contact?
Dr Zeyad Alehaideb
alehaidebze1@ngha.med.sa

Contact information

Dr Zeyad Alehaideb
Scientific

3690
Al Yasmin
Riyadh
13325 8348
Riyadh
11111
Saudi Arabia

ORCiD logoORCID ID 0000-0002-7185-2820
Phone 0566188111
Email alehaidebze1@ngha.med.sa

Study information

Study designInterventional (cross-over) single center
Primary study designInterventional
Secondary study designNon randomised study
Study setting(s)Home
Study typePrevention
Participant information sheet ISRCTN83028296_PIS_20Sept12.pdf
Scientific titleCaffeine/Angelica dahurica and caffeine/Salvia miltiorrhiza metabolic inhibition in humans: In vitro and in vivo studies.
Study objectivesCaffeine metabolism (CYP1A2-Mediated) can be modulated by pre-consumption of two Chinese medicines of Danshen (Salvia miltiorrhiza) and Baizhi (Angelica dahurica).
Ethics approval(s)Approved 20/09/2012, Simon Fraser University Office of Research Ethics Committee (Discovery 2 building, 8900 Nelson Way, Burnaby BC V5A 4W9; +1 778-782-6593dore@sfu.ca), ref: 2012s0565
Health condition(s) or problem(s) studiedN/A
InterventionParticipants are asked to refrain from ingesting caffeine, caffeinated drinks and furanocoumarin-containing foods for 3 days before and after participating in the first pharmacokinetic study (without co-treatment with an herb) and until the end of the second pharmacokinetic study (with co-treatment of an herb). Participants are provided with a study kit consisting of caffeine tablets (400 mg), an herbal extract, and several coded containers for saliva and urine sample collection. Participants conduct the studies in the home:
First pharmacokinetic study:
Time course of caffeine and metabolite concentrations in the saliva of humans without herb/food extract co-treatment. On the day of the experiment, ingest 200 mg caffeine tablets (equivalent to the amount of caffeine in a cup of coffee or in a can of energy drink). A saliva sample (about 3 ml) will be collected in a coded, siliconized glass tube just before dosing. Serial saliva samples also will be collected at 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 8 and 12 hr post-dosing. A 30 ml urine sample will be collected at 4-8 hr post caffeine administration since the half-life of caffeine clearance in the human is about 4-4.5 hr.
Second pharmacokinetic study:
Time course of caffeine and metabolite concentrations in the saliva of humans co-treated with an herb/food extract. After a 3-day wash-out period, ingest 4.5 g (or 9 g) of a dehydrated herb (or food) in the form of an aqueous extract 3 hr before ingesting the caffeine tablets. One of the following herbs or vegetables: parsnip, celery, dill, parsley, angelica, false bishop’s weed, common rue, lovage, khella, dong quai, and baizhi. A saliva sample (about 3 ml) will be collected in a coded, siliconized glass tube just before dosing. Serial saliva samples also will be collected immediately after dosing with an herb extract at 0.5, 1, 1.5, 2.5, 3.0 hr and after dosing with 200 mg caffeine at 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 8 and 12 hr. 30 ml urine samples will be collected before dosing and at 4-8 hr post-caffeine ingestion.
Intervention typeDrug
Pharmaceutical study type(s)
PhaseNot Applicable
Drug / device / biological / vaccine name(s)Caffeine; herbal whole aqueous extract of either Danshen (Salvia miltiorrhiza) and Baizhi (Angelica dahurica).
Primary outcome measureCaffeine concentrations in human saliva collected at 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 8 and 12 hr post-dosing using liquid chromatography
Secondary outcome measuresCaffeine concentrations in urine collected 4 - 8 hours post-dosing
Overall study start date26/06/2011
Completion date29/06/2017

Eligibility

Participant type(s)Healthy volunteer
Age groupAdult
SexBoth
Target number of participants8
Total final enrolment4
Key inclusion criteriaAged 20-35 years
Key exclusion criteria1. Smoker
2. On medication
3. Pregnant or breast feeding
3. Any health issue(s) that would affect the results of the study
Date of first enrolment20/06/2012
Date of final enrolment01/06/2016

Locations

Countries of recruitment

  • Canada

Study participating centre

Simon Fraser University
Department of Biological Sciences
Simon Fraser University
Burnaby
V5AIS6
Canada

Sponsor information

Simon Fraser University
University/education

Department of Biological Sciences
Burnaby
V5A 1S6
Canada

Phone +966566188111
Email zehaideb@gmail.com
Website http://www.sfu.ca
ROR logo "ROR" https://ror.org/0213rcc28
King Abdullah International Medical Research center
Research organisation

Department of Medical Genomics
King Abdullah International Medical Research Center
P.O. Box 3660
Riyadh
11111
Saudi Arabia

Phone +966566188111
Email zehaideb@gmail.com
Website http://www.kaimec.med.sa

Funders

Funder type

University/education

Simon Fraser University
Government organisation / Local government
Alternative name(s)
SFU
Location
Canada
Global Collaborative Research, King Abdullah University of Science and Technology
Private sector organisation / Research institutes and centers
Alternative name(s)
GCR, KAUST
Location
Saudi Arabia

Results and Publications

Intention to publish date01/07/2019
Individual participant data (IPD) Intention to shareYes
IPD sharing plan summaryAvailable on request
Publication and dissemination planTo be published in thesis and journals.
IPD sharing planThe datasets generated during and/or analysed during the current study are not expected to be made available due to the raw data not being available.

Study outputs

Output type Details Date created Date added Peer reviewed? Patient-facing?
Participant information sheet 20/09/2012 11/06/2019 No Yes
Results article results 01/10/2019 16/01/2020 Yes No
Results article 29/04/2021 28/04/2021 Yes No
Other publications 22/07/2021 15/10/2021 Yes No
Results article 01/03/2023 19/07/2023 Yes No

Additional files

ISRCTN83028296_PIS_20Sept12.pdf
Uploaded 11/06/2019

Editorial Notes

19/07/2023: Publication reference added.
15/10/2021: Publication reference added.
28/04/2021: Publication reference added.
16/01/2020: The following changes have been made:
1. Publication reference added.
2. The total final enrolment number has been added from the reference.
27/08/2019: Internal review.
11/06/2019: The participant information sheet has been uploaded.