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

Plain English Summary

Background and study aims
We know from a previous study that Hedrin 4% gel works with a 1 hour application time. The aim of this study is to find out whether that Hedrin 4% gel works just as well to eliminate head louse infestation using just a 15 minutes application.

Who can participate?
The study is open to anyone who has head lice over the age of 6 months and who fits the other entry criteria.

What does the study involve?
The study first involves checking for presence of lice. If you then wish to take part we shall ask you (or your carer) to sign a consent form after which we can apply the treatment. A second application of the treatment product is applied after 7 days to eliminate any young lice that emerge from eggs during that first week. We shall check the safety and acceptability of the treatment and the progress of the effectiveness when we comb everyone looking for lice twice between treatments, on days 1 and 6 after first treatment, and then twice after the second treatment on days 9 and 14. Anyone who has lice after the second treatment will be provided with a different treatment (Hedrin 4% lotion) to eliminate the infestation.

What are the possible benefits and risks of participating?
We hope everyone who takes part will have their head lice eliminated.

Where is the study run from?
The study will be conducted in and around Cambridgeshire by the Medical Entomology Centre based just outside Cambridge. Our team of investigators will visit you at home to run all the procedures so you don’t need to go anywhere.

When is the study starting and how long is it expected to run for?
The study starts in January 2010 and will run until about the end of May 2010.

Who is funding the study?
It is being funded by Thornton & Ross Ltd, the makers of Hedrin 4% lotion.

Who is the main contact?
The main contact for the study is Elizabeth Brunton at the Medical Entomology Centre.

Trial website

Contact information



Primary contact

Mr Ian Burgess


Contact details

Medical Entomology Centre
Insect Research & Development Limited
6 Quy Court
Colliers Lane
CB25 9AU
United Kingdom

Additional identifiers

EudraCT number number

Protocol/serial number


Study information

Scientific title

A proof of concept clinical investigation to evaluate the activity of Hedrin® liquid gel in the treatment of head lice using a 15 minutes application time: a single-centre non-randomised single-arm proof of concept study


Study hypothesis

To determine whether Hedrin® liquid gel is effective using a 15 minutes application in the eradication of head lice, and to evaluate the treatment regimen with regard to safety, ease of application, ease of washing, and participant acceptability.

Ethics approval

Not provided at time of registration

Study design

Single-centre non-randomised single-arm proof of concept study

Primary study design


Secondary study design

Non 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


Head louse infestation


All participants will receive the following intervention (single-arm trial): 15 minutes application of dimeticone 4% (Hedrin® liquid gel), on day 0 (at enrolment) and day 7. Patients will be followed up for 14 days from day 0.

Intervention type



Not Applicable

Drug names

Dimeticone (Hedrin® liquid gel)

Primary outcome measure

Cure of infestation, defined as no evidence of head lice, assessed between completion of the second application of treatment on day 7 and day 14 (the first treatment being applied on day 0).

Secondary outcome measures

1. Prevention of louse egg hatching (ovicidal action), defined as no 1st and 2nd stage nymphs found at assessments during the week following the first treatment or after the second application of treatment
2. Safety of the product monitored by observation for adverse events on days 0, 1, 6, 7, 9, and 14 of the study
3. Ease of use by investigators, assessed by a questionnaire on the day of the first treatment
4. Ease of washing from the hair, assessed by a participant questionnaire at the final assessment on day 14
5. Participant acceptability, assessed by a questionnaire at the final assessment on day 14

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. Both males and females, aged 6 months and over with no upper age limit
2. Participants who upon examination, are confirmed to have live head lice
3. Participants who give written informed consent, or if the participant is under 11 years of age whose parent/guardian gives written informed consent to participate in the study
4. Participants who will be available for follow-up visits by study team members over the 14 days following first treatment

Participant type


Age group




Target number of participants


Participant exclusion criteria

1. Participants with a known sensitivity to any of the ingredients in Hedrin® liquid gel
2. Participants with a secondary bacterial infection of the scalp (e.g. impetigo) or who have an active long-term scalp condition (e.g. psoriasis of the scalp)
3. Participants who have been treated with other head lice products within the previous two weeks
4. Participants who have bleached hair, or hair that has been permanently waved within the previous four weeks
5. Participants who have been treated with the antibiotics co-trimoxazole or trimethoprim within the previous four weeks, or who are currently taking such a course
6. Pregnant or nursing mothers
7. Participants who have participated in another clinical study within 1 month before entry to this study
8. Participants who have already participated in this clinical study

Recruitment start date


Recruitment end date



Countries of recruitment

United Kingdom

Trial participating centre

Medical Entomology Centre
CB25 9AU
United Kingdom

Sponsor information


Thornton & Ross Ltd (UK)

Sponsor details

United Kingdom

Sponsor type




Funder type


Funder name

Thornton & Ross Ltd (UK)

Alternative name(s)

Funding Body Type

Funding Body Subtype


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

Basic results (scientific)

Publication list

1. 2011 results in

Publication citations

  1. Results

    Burgess IF, Burgess NA, Dimeticone 4% liquid gel found to kill all lice and eggs with a single 15 minute application., BMC Res Notes, 2011, 4, 15, doi: 10.1186/1756-0500-4-15.

Additional files

Editorial Notes