Condition category
Signs and Symptoms
Date applied
Date assigned
Last edited
Retrospectively registered
Overall trial status
Recruitment status
No longer recruiting
Publication status

Plain English Summary

Not provided at time of registration

Trial website

Contact information



Primary contact

Dr Stephen Wright


Contact details

GW Pharma Ltd
Porton Down Science Park
United Kingdom

Additional identifiers

EudraCT number number


Protocol/serial number


Study information

Scientific title

A double blind, randomised, placebo controlled parallel group study of cannabis based medicine extract (CBME), in the treatment of peripheral neuropathic pain characterised by allodynia



Study hypothesis

Tetrahydrocannabinol (THC):cannabidiol (CBD), 1:1 relieves peripheral neuropathic pain characterised by allodynia.

Ethics approval

Ethics approval received from the local medical ethics committee

Study design

Double-blind randomised placebo-controlled parallel-group trial

Primary study design


Secondary study design

Randomised controlled trial

Trial setting

Not specified

Trial type


Patient information sheet

Not available in web format, please use contact details to request a participant information sheet


Peripheral neuropathic pain, characterised by allodynia


THC:CBD, 1:1 and placebo

Intervention type



Not Applicable

Drug names

Tetrahydrocannabinol (THC), cannabidiol (CBD)

Primary outcome measure

Efficacy in relieving peripheral neuropathic pain after 5 weeks of treatment

Secondary outcome measures

1. Qualitative aspects of pain as reported the Neuropathic Pain Scale (NPS)
2. The physical and psychological effects of pain using measures of sleep disturbance, the Pain Disability Index (PDI) and General Health Questionnaire (GHQ-12)
3. Patient’s cognitive function using the Brief Repeatable Battery of Neuropsychological tests (BRB-N)
4. Patient perception of change in allodynia and pain on movement after 5 weeks of treatment
5. Tolerability of CBME using the adverse event profile, electrocardiogram (ECG), clinical laboratory tests and vital signs

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. Patient or legal representative is willing and able to give informed consent for participation in the study (if the patient is unable to read or to sign the document, consent procedures as detailed in the Declaration of Helsinki must be followed)
2. Male or Female, aged 18 years or above
3. Chronic peripheral neuropathic pain of at least 6 months duration
4. Presence of mechanical allodynia within the territory of the affected nerve(s)
5. Evidence of sensory change in the affected nerve by simple clinical tests
6. Pain with a severity score of 4 or more on at least 4 completed BS-11 scores in the baseline week
7. Stable dose of current analgesic medication for at least 2 weeks prior to study entry
8. Female patients of child bearing potential and male patients whose partner is of child bearing potential are willing to ensure that they or their partner use effective contraception during the study and for 3 months thereafter
9. Willing for his or her names to be notified to the Home Office for participation in this study
10. Willing to allow his or her General Practitioner and Consultant, if appropriate, to be notified of participation in the study
11. No cannabinoid use (cannabis, Marinolâ or Nabilone) at least 7 days before Visit 1 and willing to abstain from any use of cannabis during the study
12. Able (in the Investigator’s opinion), and willing to comply with all study requirements

Participant type


Age group




Target number of participants


Total final enrolment


Participant exclusion criteria

1. History of schizophrenia, other psychotic illness, severe personality disorder or other significant psychiatric disorder other than depression associated with their underlying condition
2. Concomitant severe non-neuropathic pain or the presence of cancer related neuropathic pain or neuropathic pain resulting from diabetes mellitus
3. Known history of alcohol or substance abuse
4. Severe cardiovascular disorder, such as ischaemic heart disease, arrhythmias (other than well controlled atrial fibrillation), poorly controlled hypertension or severe heart failure
5. History of epilepsy
6. Female patient who is pregnant, lactating or planning pregnancy during the course of the study
7. Male patient who is currently receiving and unwilling to stop sildenafil (Viagra®) and unwilling to stop for the duration of the study
8. Regular levodopa therapy within 7 days of study entry
9. Significant renal or hepatic impairment
10. Known or suspected hypersensitivity to cannabinoids
11. Scheduled elective surgery or other procedures requiring general anaesthesia during the study
12. Terminal illness
13. Any other significant disease or disorder which, in the opinion of the Investigator, may either put the patient at risk because of participation in the study, or may influence the result of the study, or the patient’s ability to participate in the study
14. Travel outside the UK planned during the study
15. Donation of blood during the study
16. Patients who have participated in another research study in the past 12 weeks
17. Patients previously randomised into this study

Recruitment start date


Recruitment end date



Countries of recruitment

United Kingdom

Trial participating centre

GW Pharma Ltd
United Kingdom

Sponsor information


GW Pharma Ltd (UK)

Sponsor details

Porton Down Science Park
United Kingdom

Sponsor type




Funder type


Funder name

GW Pharma 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)

See: (added 26/09/2019)

Publication list

2007 results in: (added 26/09/2019)

Publication citations

Additional files

Editorial Notes

26/09/2019: The following changes were made to the trial record: 1. Publication reference added. 2. The total final enrolment was added. 3. number added. 4. Added link to basic results (scientific). 12/09/2016: No publications found, verifying study status with principal investigator.