Complex Regional Pain SyndromePhase 2NCT03990649
Study of TAK-935 as an Adjunctive Therapy in Adult Participants With Complex Regional Pain Syndrome (CRPS)
A Phase 2 study testing Soticlestat in people with Complex Regional Pain Syndrome, run by Millennium Pharmaceuticals, Inc. at 3 sites in United Kingdom.
Trial summary
The purpose of this study is to investigate the effect of soticlestat (TAK-935) on calculated 24-hour average pain intensity by the numeric pain scale (NPS). Read more about this study
- Who is it for?
- Ages 18 to 75 years
- Conditions the study is for
- Complex Regional Pain Syndrome
- What is being tested?
- Soticlestat
- Type of treatment
- Pill or oral medicine
- Could I receive a placebo?
- Yes, some participants may receive a placebo
- How many people
- 24 participants
- Where
- 3 sitesUnited Kingdom
- Study dates
- 23 Jul 2019to 28 Oct 2020
- Phase
- Phase 2
- Are there results?
- Yes, posted in the registrySummary in the doctors' view
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 75 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Participant meets the Budapest clinical diagnosis of complex regional pain syndrome (CRPS) at the screening visit and is at least 6 months since onset of symptoms.
- Participant's pain medications and nondrug treatments must be stable (regimented per prescription) for 1 month prior to screening and remain stable throughout Part A.
- Participant agrees to use a single previously prescribed rescue medication within the prescribed dose during Part A of the study and to record the daily use of these medications.
- Participant must have an average 24-hour pain intensity score ≥4 and ≤9 on the 24-hour average pain intensity numeric pain scale (NPS) during screening/baseline. This score will be calculated by averaging the daily 24 hour pain intensity scores for the past seven days prior to randomization. The participant must have daily 24-hour pain intensity scores recorded for at least 6 of the past 7 days.
Who cannot join
- Currently receiving intravenous (IV) or oral ketamine, history of IV or oral ketamine use within the past 6 weeks prior to screening, or planned use of IV or oral ketamine during this study.
- Participant is receiving chronic opioid treatment at a dose that has not been stable 28 days prior to screening.
- Participant is receiving chronic opioid treatment >160 mg of morphine equivalent per day.
- Participant has a positive drug screen for phencyclidine, amphetamine/ methamphetamine, or cocaine at screening. Cannabis is allowed..
- Participant is positive for hepatitis B or hepatitis C infection at screening. (Note that participants who have been vaccinated against hepatitis B [hepatitis B surface antibody {Ab}-positive] who are negative for other markers of prior hepatitis B infection [eg, negative for hepatitis B core Ab] are eligible. Also, note that participants who are positive for hepatitis C Ab are eligible if they have a negative hepatitis C viral load by quantitative polymerase chain reaction).
Trial locations and contacts
3 sites in 1 country.
United Kingdom3 sites
St Pancras Clinical Research
London, England, WC1X 8QD
Lancashire Teaching Hospitals NHS Foundation Trust
Preston, England, PR2 9HT
University Hospital Southampton NHS Foundation Trust
Southampton, England, SO16 6YD
About this study
Official title: A Phase 2a, Randomized, Double-Blind, Placebo-Controlled Study to Evaluate the Efficacy, Safety, and Tolerability of TAK-935 as an Adjunctive Therapy in Adult Subjects With Chronic Complex Regional Pain Syndrome
The purpose of this study is to investigate the effect of soticlestat (TAK-935) on calculated 24-hour average pain intensity by the numeric pain scale (NPS).
Read the detailed description
The drug being tested in this study is called soticlestat (TAK-935). Soticlestat is being tested to treat people with chronic complex regional pain syndrome (CRPS). This study will look at the efficacy, safety, and tolerability of soticlestat as an adjunctive therapy in participants with CRPS.
The study will enroll approximately 24 patients. Participants will be randomly assigned (by chance, like flipping a coin) in 2:1 ratio to one of the two treatment groups-which will remain undisclosed to the patient and study doctor during the study (unless there is an urgent medical need):
Soticlestat 100 mg tablets, 100, 200 or 300 mg twice daily (BID) Placebo (dummy inactive pill) - this is a tablet that looks like the study drug but has no active ingredient
Participants will receive 100 mg soticlestat tablets or soticlestat matching placebo tablets, BID for Week 1, 2x100 mg soticlestat tablets or soticlestat matching placebo tablets, BID for Week 2 and followed by 3x100 mg soticlestat tablets or soticlestat matching placebo tablets, BID for Week 3. Dose will be uptitrated based on safety and tolerability in titration period. Participants will continue to receive the same dose in maintenance period. Dose adjustments during maintenance period may take place due to safety and tolerability.
Participants will then enter Part B (optional) or taper period. In Part B all participants will receive soticlestat 2x100 mg tablets, BID for 1 Week, followed by soticlestat 3x100 mg tablets, BID for 1 Week. Dose will be uptitrated/downtitrated based on safety and tolerability in titration period (Part B), participants will continue to receive the same dose in maintenance period (Part B) and followed by a taper period.
This multi-center trial will be conducted in United Kingdom. The overall time to participate in this study is approximately 36 weeks. Participants will make multiple visits to the clinic and will be contacted by telephone 15 days after last dose of study drug for a follow-up assessment.
- Conditions
- Complex Regional Pain Syndrome
- Being tested
- Soticlestat, Placebo
- Keywords
- Drug Therapy, Soticlestat, TAk-935
- Medical subject headings
- Complex Regional Pain Syndromes
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
SoticlestatDrug
Also called TAK-935
Soticlestat tablets
PlaceboDrug
Soticlestat matching placebo tablets
| Study group | Role | What they receive |
|---|---|---|
| Double-Blind Treatment Period - Part A: Placebo | Placebo comparator | Soticlestat matching placebo tablets, orally, twice daily (BID) for Weeks 1, 2 and 3 in Double blind Titration Period. Soticlestat matching placebo tablets, orally BID for 12 weeks in Double blind Maintenance Period. Taper period (if participant did not continue to Part B): Dose of soticlestat matching placebo tablets was reduced to next lower dose every 3 days (maximum 6 days) until discontinuation. Receives: Drug: Placebo |
| Double-Blind Treatment Period - Part A: Soticlestat | Experimental | Soticlestat, tablet, orally, 100 mg BID for Week 1, followed by 2×100 mg tablets, soticlestat, orally BID for Week 2, further followed by 3×100 mg tablets, soticlestat, orally BID for Week 3. Dose was uptitrated every week based on safety and tolerability. Part A (Double blind Maintenance Period): 3×100 mg tablets, soticlestat, orally BID for 12 weeks. Dose was adjusted during Maintenance Period due to safety and tolerability. Taper Period (if participant did not continue to Part B): Dose of soticlestat was reduced to next lower dose every 3 days (maximum 6 days) until soticlestat was discontinued. Receives: Drug: Soticlestat |
| Open-Label Extension Period - Part B: Soticlestat | Experimental | Soticlestat, 2×100 mg tablets, orally, BID for Week 1, followed by 3×100 mg tablets, soticlestat, orally, BID for Week 2. Dose was uptitrated every week based on safety and tolerability. Part B (Open label extension: Maintenance Period): 3×100 mg tablets, soticlestat, orally, BID for 12 weeks. Dose was adjusted during Maintenance Period due to safety and tolerability. Taper Period: Dose of soticlestat was reduced to next lower dose every 3 days (maximum 6 days) until soticlestat was discontinued. Receives: Drug: Soticlestat |
What is being measured
The primary outcome is the main question the study is designed to answer.
Change From Baseline in Mean 24-Hour Pain Intensity as Assessed by NPS Score to the End of Part A
The 24-hour average pain intensity was calculated from current pain intensity scores collected three times a day as measured by the electronic pain diary daily using NPS. NPS is an 11-point scale, where scores range from 0-10, 0= no pain to 10 = most pain imaginable. Negative change from Baseline indicated improvement.
Measured: Baseline and Week 15
Secondary outcomes (7)
Percent Change From Baseline in Mean 24-Hour Pain Intensity as Assessed by NPS Score to the End of Part A
The 24-hour average pain intensity was calculated from current pain intensity scores collected three times a day as measured by the electronic pain diary daily using NPS. NPS is an 11-point scale, where scores range from 0-10, 0= no pain to 10 = most pain imaginable. Negative percent change from Baseline indicated improvement.
Measured: Baseline and Week 15
Percentage of Participants Considered Responders at the End of Part A
Response was defined as ≥ 30% improvement on the 24-hour pain intensity as assessed by the NPS score. The 24-hour average pain intensity was calculated from current pain intensity scores collected three times a day as measured by the electronic pain diary daily using NPS during Part A. NPS is an 11-point scale, where scores range from 0-10, 0= no pain to 10 = most pain imaginable.
Measured: Week 15
Change From Baseline in Domain Score of PROMIS-29 Version 2.1 at the End of Part A
PROMIS-29 (v2.1) is a health-related quality of life survey assessing 7 domains with 4 questions on a 5-point Likert scale. Total raw domain scores are converted into T-scores from a reference population: Depression: 1=never to 5=always, T-scores:41.0-79.4; Physical function: 1=unable to do to 5=without any difficulty, T-scores: 22.5-57.0; Anxiety: 1=never to 5=always, T-scores: 40.3-81.6; Pain interference: 1=not at all to 5=very much, T-scores: 41.6-75.6; Fatigue: 1=not at all to 5=very much, T-scores: 33.7-75.8; Sleep disturbance: 1=very much to 5=not at all, T-scores: 32.0-73.3; Ability to participate in social roles or activities: 1=always to 5=never, T-scores: 27.5-64.2. High scores signify more of domain being measured. Thus, on symptom-oriented domains, higher scores=worse symptomatology and a negative change from Baseline indicates improvement. On function-oriented domains, higher score=better functioning and a positive change from Baseline indicates improvement.
Measured: Baseline and Week 15
Percent Change From Baseline in Domain Score of PROMIS-29 Version 2.1 at the End of Part A
PROMIS-29 (v2.1) is a health-related quality of life survey assessing 7 domains with 4 questions on a 5-point Likert scale. Total raw domain scores are converted into T-scores from a reference population: Depression: 1=never to 5=always, T-scores:41.0-79.4; Physical function: 1=unable to do to 5=without any difficulty, T-scores: 22.5-57.0; Anxiety: 1=never to 5=always, T-scores: 40.3-81.6; Pain interference: 1=not at all to 5=very much, T-scores: 41.6-75.6; Fatigue: 1=not at all to 5=very much, T-scores: 33.7-75.8; Sleep disturbance: 1=very much to 5=not at all, T-scores: 32.0-73.3; Ability to participate in social roles or activities: 1=always to 5=never, T-scores: 27.5-64.2. High scores signify more of domain being measured. Thus, on symptom-oriented domains, higher scores=worse symptomatology and a negative change from Baseline indicates improvement. On function-oriented domains, higher score=better functioning and a positive change from Baseline indicates improvement.
Measured: Baseline and Week 15
Percentage of Participants in Each Category of the Patient Global Impression of Change (PGIC) Scale at the End of Part A
The PGIC is a 7-point Likert scale to address the following question: Since beginning treatment at this clinic would you describe any changes (if any) in activity, limitations, symptoms, emotions and overall quality of life related to your painful condition compared to before treatment? Participants select from scale range of 1-7: very much improved (1); much improved (2); minimally improved (3); no change (4); minimally worse (5); much worse (6); very much worse (7). Only categories with at least 1 participant were reported.
Measured: Week 15
Change From Baseline in Complex Regional Pain Syndrome (CSS) at the End of Part A
Signs and symptoms reflecting the sensory, vasomotor, sudomotor/edema, and motor/trophic disturbances of CRPS had been incorporated into a clinically feasible CSS. Total CSS is a 16-point score which was calculated by the number of "yes" answers to the questions on the 8 symptoms and 8 signs when all 16 questions were answered. Negative change from Baseline indicates improvement.
Measured: Baseline and Week 15
Percent Change From Baseline in CSS at the End of Part A
Signs and symptoms reflecting the sensory, vasomotor, sudomotor/edema, and motor/trophic disturbances of CRPS had been incorporated into a clinically feasible CSS. Total CSS is a 16-point score which was calculated by the number of "yes" answers to the questions on the 8 symptoms and 8 signs when all 16 questions were answered. Negative percent change from Baseline indicates improvement.
Measured: Baseline and Week 15
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted19 Jun 2019
- Study start23 Jul 2019
- Primary completion29 Jun 2020
- Study completion28 Oct 2020
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Posted resultsParticipant flow, outcome measures and adverse events reported by the sponsor.
- Publications (1)Papers the sponsor has linked to this study.
- Other trials for Complex Regional Pain SyndromeStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 2
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Quadruple blind
- Who is masked
- Participant, Care provider, Investigator, Outcomes assessor
- Enrolment
- 24 participants (actual)
Sponsor and investigators
- Lead sponsor
- Millennium Pharmaceuticals, Inc.
- Sponsor type
- Industry (pharma, biotech, devices)
- Responsible party
- Sponsor
- Investigators
- Study Director, Study director, Takeda (Note: This product was divested to Mistrau Bio, Inc. in 2026)
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT03990649
- Sponsor's protocol ID
- TAK-935-2008
- Status last verified
- Aug 2026
- First submitted
- 17 Jun 2019
- Last updated
- 14 Sep 2026
- Results posted
- Yes, on ClinicalTrials.gov
- Data monitoring committee
- No
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
- Individual data sharing
- Yes: Takeda provides access to the de-identified individual participant data (IPD) for eligible studies to aid qualified researchers in addressing legitimate scientific objectives (Takeda's data sharing commitment is available on https://clinicaltrials.takeda.com/takedas-commitment?commitment=5). These IPDs will be provided in a secure research environment following approval of a data sharing request, and under the terms of a data sharing agreement.
Publications
Ratcliffe S, Arkilo D, Asgharnejad M, Bhattacharya S, Harden RN. Randomized controlled study to evaluate the efficacy and safety of soticlestat as adjunctive therapy in adults with complex regional pain syndrome. Pain Med. 2023 Jul 5;24(7):872-880. doi: 10.1093/pm/pnac198.
PubMed 36538782
Study at a glance
From the registry record, last updated by the sponsor on 14 Sep 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Phase 2a, Randomized, Double-Blind, Placebo-Controlled Study to Evaluate the Efficacy, Safety, and Tolerability of TAK-935 as an Adjunctive Therapy in Adult Subjects With Chronic Complex Regional Pain Syndrome
- ClinicalTrials.gov ID
- NCT03990649
- Acronym / sponsor ID
- TAK-935-2008
- Conditions
- Complex Regional Pain Syndrome
- Keywords
- Drug Therapy, Soticlestat, TAk-935
- Phase
- Phase 2
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 24 participants (actual)
- Lead sponsor
- Millennium Pharmaceuticals, Inc.Industry (pharma, biotech, devices)
- Study start
- 23 Jul 2019 (actual)
- Primary completion
- 29 Jun 2020 (actual)
- Study completion
- 28 Oct 2020 (actual)
- First posted
- 19 Jun 2019 (actual)
- Results
- Posted 15 Jul 2021
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The purpose of this study is to investigate the effect of soticlestat (TAK-935) on calculated 24-hour average pain intensity by the numeric pain scale (NPS).
Detailed description
The drug being tested in this study is called soticlestat (TAK-935). Soticlestat is being tested to treat people with chronic complex regional pain syndrome (CRPS). This study will look at the efficacy, safety, and tolerability of soticlestat as an adjunctive therapy in participants with CRPS.
The study will enroll approximately 24 patients. Participants will be randomly assigned (by chance, like flipping a coin) in 2:1 ratio to one of the two treatment groups-which will remain undisclosed to the patient and study doctor during the study (unless there is an urgent medical need):
Soticlestat 100 mg tablets, 100, 200 or 300 mg twice daily (BID) Placebo (dummy inactive pill) - this is a tablet that looks like the study drug but has no active ingredient
Participants will receive 100 mg soticlestat tablets or soticlestat matching placebo tablets, BID for Week 1, 2x100 mg soticlestat tablets or soticlestat matching placebo tablets, BID for Week 2 and followed by 3x100 mg soticlestat tablets or soticlestat matching placebo tablets, BID for Week 3. Dose will be uptitrated based on safety and tolerability in titration period. Participants will continue to receive the same dose in maintenance period. Dose adjustments during maintenance period may take place due to safety and tolerability.
Participants will then enter Part B (optional) or taper period. In Part B all participants will receive soticlestat 2x100 mg tablets, BID for 1 Week, followed by soticlestat 3x100 mg tablets, BID for 1 Week. Dose will be uptitrated/downtitrated based on safety and tolerability in titration period (Part B), participants will continue to receive the same dose in maintenance period (Part B) and followed by a taper period.
This multi-center trial will be conducted in United Kingdom. The overall time to participate in this study is approximately 36 weeks. Participants will make multiple visits to the clinic and will be contacted by telephone 15 days after last dose of study drug for a follow-up assessment.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Quadruple blind (participant, care provider, investigator, outcomes assessor)
- Number of arms
- 3
| Arm | Type | Receives |
|---|---|---|
| Double-Blind Treatment Period - Part A: Placebo | Placebo comparator | Drug: PlaceboSoticlestat matching placebo tablets, orally, twice daily (BID) for Weeks 1, 2 and 3 in Double blind Titration Period. Soticlestat matching placebo tablets, orally BID for 12 weeks in Double blind Maintenance Period. Taper period (if participant did not continue to Part B): Dose of soticlestat matching placebo tablets was reduced to next lower dose every 3 days (maximum 6 days) until discontinuation. |
| Double-Blind Treatment Period - Part A: Soticlestat | Experimental | Drug: SoticlestatSoticlestat, tablet, orally, 100 mg BID for Week 1, followed by 2×100 mg tablets, soticlestat, orally BID for Week 2, further followed by 3×100 mg tablets, soticlestat, orally BID for Week 3. Dose was uptitrated every week based on safety and tolerability. Part A (Double blind Maintenance Period): 3×100 mg tablets, soticlestat, orally BID for 12 weeks. Dose was adjusted during Maintenance Period due to safety and tolerability. Taper Period (if participant did not continue to Part B): Dose of soticlestat was reduced to next lower dose every 3 days (maximum 6 days) until soticlestat was discontinued. |
| Open-Label Extension Period - Part B: Soticlestat | Experimental | Drug: SoticlestatSoticlestat, 2×100 mg tablets, orally, BID for Week 1, followed by 3×100 mg tablets, soticlestat, orally, BID for Week 2. Dose was uptitrated every week based on safety and tolerability. Part B (Open label extension: Maintenance Period): 3×100 mg tablets, soticlestat, orally, BID for 12 weeks. Dose was adjusted during Maintenance Period due to safety and tolerability. Taper Period: Dose of soticlestat was reduced to next lower dose every 3 days (maximum 6 days) until soticlestat was discontinued. |
Who may qualify
- Ages
- 18 to 75 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (4 listed)
- Participant meets the Budapest clinical diagnosis of complex regional pain syndrome (CRPS) at the screening visit and is at least 6 months since onset of symptoms.
- Participant's pain medications and nondrug treatments must be stable (regimented per prescription) for 1 month prior to screening and remain stable throughout Part A.
- Participant agrees to use a single previously prescribed rescue medication within the prescribed dose during Part A of the study and to record the daily use of these medications.
- Participant must have an average 24-hour pain intensity score ≥4 and ≤9 on the 24-hour average pain intensity numeric pain scale (NPS) during screening/baseline. This score will be calculated by averaging the daily 24 hour pain intensity scores for the past seven days prior to randomization. The participant must have daily 24-hour pain intensity scores recorded for at least 6 of the past 7 days.
Key exclusion criteria (5 listed)
- Currently receiving intravenous (IV) or oral ketamine, history of IV or oral ketamine use within the past 6 weeks prior to screening, or planned use of IV or oral ketamine during this study.
- Participant is receiving chronic opioid treatment at a dose that has not been stable 28 days prior to screening.
- Participant is receiving chronic opioid treatment >160 mg of morphine equivalent per day.
- Participant has a positive drug screen for phencyclidine, amphetamine/ methamphetamine, or cocaine at screening. Cannabis is allowed..
- Participant is positive for hepatitis B or hepatitis C infection at screening. (Note that participants who have been vaccinated against hepatitis B [hepatitis B surface antibody {Ab}-positive] who are negative for other markers of prior hepatitis B infection [eg, negative for hepatitis B core Ab] are eligible. Also, note that participants who are positive for hepatitis C Ab are eligible if they have a negative hepatitis C viral load by quantitative polymerase chain reaction).
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| SoticlestatAlso: TAK-935Soticlestat tablets | Drug | Double-Blind Treatment Period - Part A: Soticlestat, Open-Label Extension Period - Part B: Soticlestat |
| PlaceboSoticlestat matching placebo tablets | Drug | Double-Blind Treatment Period - Part A: Placebo |
Primary outcome
Change From Baseline in Mean 24-Hour Pain Intensity as Assessed by NPS Score to the End of Part A
Time frame: Baseline and Week 15
The 24-hour average pain intensity was calculated from current pain intensity scores collected three times a day as measured by the electronic pain diary daily using NPS. NPS is an 11-point scale, where scores range from 0-10, 0= no pain to 10 = most pain imaginable. Negative change from Baseline indicated improvement.
7 secondary outcomes
Percent Change From Baseline in Mean 24-Hour Pain Intensity as Assessed by NPS Score to the End of Part A
Time frame: Baseline and Week 15
Percentage of Participants Considered Responders at the End of Part A
Time frame: Week 15
Change From Baseline in Domain Score of PROMIS-29 Version 2.1 at the End of Part A
Time frame: Baseline and Week 15
Percent Change From Baseline in Domain Score of PROMIS-29 Version 2.1 at the End of Part A
Time frame: Baseline and Week 15
Percentage of Participants in Each Category of the Patient Global Impression of Change (PGIC) Scale at the End of Part A
Time frame: Week 15
Change From Baseline in Complex Regional Pain Syndrome (CSS) at the End of Part A
Time frame: Baseline and Week 15
Percent Change From Baseline in CSS at the End of Part A
Time frame: Baseline and Week 15
Results and safety
Loading the posted results from ClinicalTrials.gov…
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 14 Sep 2026.
- Posted resultsParticipant flow, baseline, all outcome measures and adverse events.
- Derived from this study: PubMed 36538782Ratcliffe S, Arkilo D, Asgharnejad M, Bhattacharya S, Harden RN. Randomized controlled study to evaluate the efficacy and safety of soticlestat as adjunctive therapy in adults with complex regional pain syndrome. Pain Med. 2023 Jul 5;24(7):872-880. doi: 10.1093/pm/pnac198.
- Individual participant dataSharing planned: Yes. Takeda provides access to the de-identified individual participant data (IPD) for eligible studies to aid qualified researchers in addressing legitimate scientific objectives (Takeda's data sharing commitment is available on https://clinicaltrials.takeda.com/takedas-commitment?commitment=5). These IPDs will be provided in a secure research environment following approval of a data sharing request, and under the terms of a data sharing agreement.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Study Director study director
Takeda (Note: This product was divested to Mistrau Bio, Inc. in 2026)
3 sites in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 2 study testing Soticlestat in people with Complex Regional Pain Syndrome, run by Millennium Pharmaceuticals, Inc. at 3 sites in United Kingdom.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 5 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 14 Sep 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 3 sites in United Kingdom. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
Yes. Results are posted in the registry (first posted 15 Jul 2021). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Change From Baseline in Mean 24-Hour Pain Intensity as Assessed by NPS Score to the End of Part A (time frame: Baseline and Week 15). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT03990649, which also lists 1 linked publication.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 14 Sep 2026.