Condition category
Infections and Infestations
Date applied
Date assigned
Last edited
Prospectively registered
Overall trial status
Recruitment status
No longer recruiting

Plain English Summary

Background and study aims
Opisthorchiasis and clonorchiasis are parasitic liver fluke infections that are of considerable public health significance in Southeast Asia. There is currently no vaccine available for prevention of liver fluke infections, and hence drug treatment is the current mainstay for clearing infections and subsequently reducing illness. However, treatment of opisthorchiasis relies on a single drug, praziquantel. Efforts are underway to more widely administer praziquantel to prevent infections. There is some concern that this strategy might result in the development and spread of drug-resistant parasites. Against this background, there is a need for new drugs. The aim of this study is to assess the effectiveness and safety of oral tribendimidine, a Chinese anti-parasitic drug, in patients with opisthorchiasis.

Who can participate?
Patients aged over 8 with opisthorchiasis.

What does the study involve?
In the first part of the study, participants are assigned to six different groups depending on age. Children aged 8-14 are randomly allocated into three groups, with each group receiving a different dose of tribendimidine. Adults and adolescents aged 15 and above are also randomly allocated into three groups, with each group receiving a different dose of tribendimidine. Blood and stool samples are taken. In the second part of the study, participants are randomly allocated into one of two groups. One group receives the most effective dose of tribendimidine as identified in the first part of the study. The other group is treated with praziquantel in two divided doses. This part of the study is only carried out if the results of the first part of the study are satisfactory. All patients are closely monitored for illness during the period of drug administration. Patients who report adverse events are examined carefully by the study doctor and, when necessary, medical action is taken on the spot or patients are referred to a nearby hospital.

What are the possible benefits and risks of participating?
Not provided at time of registration

Where is the study run from?
Swiss Tropical and Public Health Institute (Switzerland)

When is the study starting and how long is it expected to run for?
October 2012 to September 2013

Who is funding the study?
Department for International Development (UK), Medical Research Council (UK), Wellcome Trust (UK)

Who is the main contact?
Dr Peter Odermatt

Trial website

Contact information



Primary contact

Dr Peter Odermatt


Contact details

Swiss Tropical and Public Health Institute
Socinstrasse 57

Additional identifiers

EudraCT number number

Protocol/serial number


Study information

Scientific title

Tribendimidine for the treatment of liver fluke infection in Southeast Asia in Laos



Study hypothesis

1. Tribendimidine dosage for the treatment of Opisthorchis viverrini liver fluke is the same as the dosage for the other intestinal parasitic infections
2. Tribendimidine has a higher efficacy and fewer adverse events than the current standard treatment with praziquantel

Ethics approval

1. Ethics Committee of the Canton of Basel and Baselland, 09/02/2012, ref: EKBB 375/11
2. National Ethics Committee Laos, Ministry of Health
3. Liverpool School of Tropical Medicine, Research Ethics Committee, 03/05/2012, ref: 12.02RS

Study design

Randomized controlled trial

Primary study design


Secondary study design

Randomised controlled trial

Trial setting


Trial type


Patient information sheet

Not available in web format, please use the contact details below to request a patient information sheet


Liver fluke (Opisthorchis viverrini) infection


1. Dose finding 2a trial: Children aged 0 to 14 years will be randomized into 3 groups:
Group 1 will receive 50 mg
Group 2 will receive 100 mg
Group 3 200mg tribendimidine.
Patients aged 15 years and above will also be randomized into three treatment roups: group 1 will be receive a treatment dose of 100 mg, group 2 200 mg and group 3 400 mg of tribendimidine. Study participants will be randomly assigned to one of these arms using a computerized block randomization procedure.
2. Randomised controlled trial 2b: Most efficacious tribendimidine dosage of trial compared with praziquantel 75mg /kg BW devided in two doses (50 mg/kg BW, 25 mg /kg BW) 4 hours apart

Intervention type



Not Applicable

Drug names


Primary outcome measures

O. viverrini infection: cure rates and egg reduction rates

Secondary outcome measures

1. Adverse events observed with tribendimidine and praziquantel
2. PK parameters of tribendimidine in patients infected with O. viverrini
3. Co-infection with soil-transmitted helminths (hookworm, A. lumbricoides, T. trichiura)

Overall trial start date


Overall trial end date


Reason abandoned


Participant inclusion criteria

1. Patients (older than 8 years) infected with O. viverrini (respectively: C. sinensis in PR China), as assessed by the presence of eggs in the stool
2. Able and willing to be examined by a study physician at the beginning of the study and at the end-of study (3 weeks post-treatment)
3. Able and willing to provide 2 stool samples at the beginning and end of study
4. Absence of major systemic illnesses, as assessed by the medical doctor, upon initial clinical assessment
5. Absence of psychiatric and neurological disorders
6. No known or reported hypersensitivity to tribendimidine
7. No known or reported history of chronic illness as cancer, diabetes, chronic heart, liver or renal disease
8. Signed written informed consent sheet
9. For females aged 12 years and above, not pregnant, as assessed by a female nurse (interview and pregnancy test), upon initial clinical assessment

Participant type


Age group




Target number of participants


Participant exclusion criteria

1. Pregnancy
2. Presence of any abnormal medical condition, judged by the study physician.
3. Concurrent non-helminthic infectious disease as judged by the study clinician (for malaria, use rapid diagnostic test to diagnose).
4. History of acute or severe chronic disease
5. Known or reported psychiatric or neurological disorders
6. Use of praziquantel and other helminth treatment within the past three months
7. Attending other clinical trials during the study

Recruitment start date


Recruitment end date



Countries of recruitment


Trial participating centre

Swiss Tropical and Public Health Institute

Sponsor information


Swiss Tropical and Public Health Institute (Switzerland)

Sponsor details

c/o Dr eter Odermatt
Socinstrasse 57

Sponsor type

Research organisation



Funder type


Funder name

Department for International Development

Alternative name(s)

Department for International Development, UK, DFID

Funding Body Type

government organisation

Funding Body Subtype

Federal/National Government


United Kingdom

Funder name

Medical Research Council (ref: G1100699)

Alternative name(s)


Funding Body Type

private sector organisation

Funding Body Subtype

other non-profit


United Kingdom

Funder name

Wellcome Trust (ref: 096471)

Alternative name(s)

Funding Body Type

private sector organisation

Funding Body Subtype



United Kingdom

Results and Publications

Publication and dissemination plan

Not provided at time of registration

Intention to publish date

Participant level data

Not provided at time of registration

Results - basic reporting

Publication summary

2016 results in:

Publication citations

Additional files

Editorial Notes

01/08/2016: Publication reference added.