Rheumatoid ArthritisPhase 2CHAPPIINCT05942911
Safety and Effect on Pain and Function According to RAPID-3 of IHL-675A in Patients With Rheumatoid Arthritis
A Phase 2 study testing IHL-675A, Cannabidiol and Hydroxychloroquine in people with Rheumatoid Arthritis, run by Incannex Healthcare Ltd at 10 sites in Australia.
Trial summary
The goal of this randomised, double-blind, placebo-controlled Phase II clinical trial is to assess the safety and effect of of IHL-675A in rheumatoid arthritis patients on pain, and function according to RAPID-3. 128 volunteers will be enrolled and randomised to one of four treatments (32 subjects per treatment). Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Rheumatoid Arthritis
- What is being tested?
- IHL-675A, Cannabidiol and Hydroxychloroquine
- Type of treatment
- Pill or oral medicine
- Could I receive a placebo?
- Yes, some participants may receive a placebo
- How many people
- 20 participants
- Where
- 10 sitesAustralia
- Study dates
- 22 Nov 2023to 28 Oct 2025
- Phase
- Phase 2
- Are there results?
- None posted in the registry
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 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Subjects will be included in the study if they satisfy all the following criteria:
- Must have given written informed consent, before any study-related activities are carried out and must be able to understand the full nature and purpose of the trial, including possible risks and adverse effects
- Has been diagnosed with RA and on stable treatment for RA for at least 3 months prior to the screening visit
- Subject has a RAPID-3 score of >4.5 at screening
- Male or female, aged 18 or older inclusive at the screening visit
- Body mass index (BMI) of 18 to 32 kg/m2, inclusive, at screening
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- Has at least two swollen or tender joints on the JC 66/68 at screening
- Subject is otherwise medically healthy (in the opinion of the investigator), as determined by pre-study medical history and without clinically significant abnormalities including:
- Physical examination at screening without any additional clinically relevant findings apart from those consistent with RA in the opinion of the investigator.
- Systolic blood pressure at screening in the range of 90 to 160 mmHg and diastolic blood pressure in the range of 50 to 95 mmHg after 5 minutes in supine or semi-supine position.
- Pulse rate at screening in the range of 45 to 100 beats/minute after 5 minutes rest in supine or semi-supine position.
- Body temperature (tympanic) at screening between 35.5°C and 37.5°C.
- Electrocardiogram (ECG) at screening without clinically significant abnormal findings including QT interval corrected for Fredericia (QTcF) ≤470msec for females and ≤450msec for males.
- Physically well, in the opinion of the investigator, with no severe psychiatric, cardiac, renal, endocrine, gastrointestinal, bleeding, thyroid, cholesterol, or hypertension disorders
- Male subjects must:
- Agree not to donate sperm from the time of signing consent until at least 340 days (t1/2 *5 +90 days) after the last dose of study drug
- If engaging in sexual intercourse with a female partner who could become pregnant, must agree to use adequate contraception (defined as use of a condom plus a highly effective method of contraception (Appendix 10) from the time of signing consent until at least 340 days after the last dose of study drug).
- If engaging in sexual intercourse with a female partner who is not of childbearing potential or a same-sex partner, must agree to use a condom from the time of signing consent until at least 340 days after the last dose of study drug.
- Female subjects must be of non-childbearing potential i.e., surgically sterilised (hysterectomy, bilateral salpingectomy, bilateral oophorectomy at least 6 weeks before screening) or postmenopausal (where postmenopausal is defined as no menses for 12 months without an alternative medical cause and a follicle-stimulating hormone (FSH) level consistent with postmenopausal status, per local laboratory guidelines), or, if of childbearing potential (Women who have been surgically sterilised through tubal ligation are permitted to participate, if they agree to use an additional barrier method of contraception from one month prior to the first dose of study drug, until at least 280 days (t1/2 * 5 +30 days) after the last dose of study drug.):
- Must have a negative serum pregnancy test at screening and a negative urine pregnancy test prior to administration of the first dose of study drug. Note: subjects must also have a negative urine pregnancy test at each clinic visit.
- Must agree not to donate ova or attempt to become pregnant from the time of signing consent until at least 280 days after the last dose of study drug.
- If not exclusively in a same-sex relationship, must agree to use adequate contraception (which is defined as use of a condom by the male partner combined with use of a highly effective method of contraception (Appendix 10) from one month prior the first dose of study drug until at least 280 days after the last dose of study drug).
- Able to avoid strenuous exercise from 72 hours prior to each visit to the clinical unit
- Fluent in written and spoken English
- Willing and able to comply with all study required tasks, including the completion of questionnaires, and to adhere to the study schedule and restrictions, as instructed by the protocol.
Who cannot join
- Subjects will be excluded from the study if there is evidence of any of the following at screening.
- Subjects will be excluded from the study if there is evidence of any of the following at screening.
- Known hypersensitivity to any of the study drug ingredients (cannabis products, sesame oil, hydroxychloroquine or chloroquine)
- History of any clinically significant (in the opinion of the investigator) disorder within the last 3 months including cardiovascular (cardiac disease or arrythmias), haematologic, pulmonary, hepatic, renal, or gastrointestinal (such as cholecystitis, Gilbert's syndrome) disorders, or connective tissue, uncontrolled endocrine/metabolic, oncologic (within the last 5 years), neurologic, or any disorder within the last 3 months that may prevent the successful completion of the study or influence the absorption, distribution, metabolism, excretion or action of the study drug (in the opinion of the investigator). Note: a history of fully resolved childhood asthma is not exclusionary; a history of cholecystectomy is not exclusionary
- Family history of QT issues
- Currently taking or have taken hydroxychloroquine, chloroquine or any drugs containing HCQ or chloroquine within 3 months of screening
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- Taking more than 10 mg prednisone per day
- Pregnant, lactating, planning to become pregnant
- Known substance abuse or medical, psychological, or social conditions or significant psychiatric illness (defined as hospitalisation), suicidal ideation, or suicidal attempts that, in the opinion of the investigator, may interfere with the subjects inclusion in the clinical study or evaluation of the clinical study results
- Regular consumption of >10 standard alcoholic drinks/week where 1 standard drink is 10 g of pure alcohol and is equivalent to 285 mL beer [4.9% Alc/Vol], 100 mL wine [12% Alc/Vol], 30 mL spirit [40% Alc/Vol])
- Positive urine illicit drug test at screening
- C-SSRS score ≥4 OR reported suicidal behaviour within the past 3 months
- Hepatic or renal impairment or disease defined as aspartate aminotransferase (AST)/ alanine aminotransferase (ALT) >1.5 x upper limit of normal (ULN), estimated glomerular filtration rate (eGFR) <60 at screening
- Subject has retinopathy or history thereof (as determined by the OCT eye examination at screening)
- A positive test result for active human immunodeficiency virus (HIV-1 or HIV-2), hepatitis B antigen (HBsAg) or hepatitis C virus (HCV) antibodies at the screening visit.
- History of gastrointestinal disorders which may impact absorption, distribution, metabolism and/or excretion of the IP (such as cholecystitis, cholecystectomy, Gilbert's syndrome)
- Participation in another clinical trial of an investigational drug within 30 Days or 5 half-lives of the investigational drug (whichever is longer) prior to screening
- Any other condition or prior therapy that in the opinion of the Investigator (or delegate) would make the subject unsuitable for this study, including inability to cooperate fully with the requirements of the study protocol or likelihood of noncompliance with any study requirements.
- MRI Sub-Study Inclusion Criteria:
- Subjects may also participate in the MRI Sub-Study based on the below inclusion criteria.
- Must have given written informed consent to participate in the MRI sub-study
- Able and willing to undergo an MRI
- Have at least 1 swollen and/or tender joint in left or right wrist or hand
- Have a RAMRIS synovitis score of at least 1
Trial locations and contacts
10 sites in 1 country.
10 sites in 1 country
Australia10 sites
Genesis Research Services
Broadmeadow, New South Wales, 2292
Emeritus Research Melbourne
Camberwell, Victoria, 3124
Royal Prince Alfred Hospital
Camperdown, New South Wales, 2050
Novatrials
Kotara, New South Wales, 2289
Coast Joint Care
Maroochydore, Queensland, 4558
Captain Sterling Medical Centre
Nedlands, Western Australia, 6009
Paratus Clinical (Woden Dermatology)
Phillip, Australian Capital Territory, 2606
Emeritus Research
Sydney, New South Wales, 2019
AusTrials Westside (Taringa)
Taringa, Queensland, 4068
AusTrials Wellers Hill
Wellers Hill, Queensland, 4121
About this study
Official title: A Phase II, Blinded, Randomised, Placebo Controlled Clinical Trial to Determine the Safety and Effect on Pain and Function According to RAPID-3 of IHL-675A in Patients With Rheumatoid Arthritis
The goal of this randomised, double-blind, placebo-controlled Phase II clinical trial is to assess the safety and effect of of IHL-675A in rheumatoid arthritis patients on pain, and function according to RAPID-3.
128 volunteers will be enrolled and randomised to one of four treatments (32 subjects per treatment). Each treatment will be self-administered twice daily for 24 weeks.
The four treatments are:
- Treatment 1 - IHL-675A
- Treatment 2 - CBD
- Treatment 3 - HCQ
- Treatment 4 - Placebo
Read the detailed description
This is a Phase II, double-blind, randomised, placebo-controlled clinical trial to assess the safety and effect of IHL-675A (a combination of cannabidiol (CBD) and hydroxychloroquine (HCQ)) on pain and function using the RAPID-3 patient reported outcome (PRO) in patients with Rheumatoid Arthritis. This study will compare IHL-675A to the component drugs, CBD and HCQ, as well as a placebo. The study will aim to enrol a total of 128 subjects across the 4 treatment groups (32 per group).
The study will also assess structural changes in joint damage in an MRI sub-study using the Rheumatoid Arthritis Magnetic Resonance Imaging Score (RAMRIS).
During the 28-day screening period, subjects will provide information on their demographics, medical history, history of inflammatory conditions and weight/body mass index (BMI). A physical exam, vital signs, and 12-lead ECG will be conducted. Urine and blood samples will be collected for urinalysis, to assess for pregnancy, the presence of illicit drugs and to detect any clinically significant outcomes that would exclude subjects from being eligible for the clinical trial and to measure erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) levels. A series of questionnaires will be conducted to assess eligibility and mental health status.
These questionnaires will be:
- RAPID-3
- JC 66/68
- Health Assessment Questionnaire-Disability Index (HAQ-DI)
- Columbia-Suicide Severity Rating Scale (C-SSRS) Subjects will also undergo an optical coherence tomography (OCT) eye examination to rule out retinopathy.
Subjects who have consented to the MRI sub-study will also undergo an MRI during screening.
Once the participant is deemed eligible to be enrolled in the study, the baseline visit will be performed and the participant will be randomised into one of the four treatment groups:
- Treatment 1 - IHL-675A (150 mg CBD, 200 mg HCQ: two soft gel capsules each containing 75 mg CBD and 100 mg HCQ twice per day for a total daily dose of 300 mg CBD and 400 mg HCQ)
- Treatment 2 - CBD (150 mg: two capsules each containing 75 mg CBD twice per day for a total daily dose of 300 mg CBD)
- Treatment 3 - HCQ (200 mg: two capsules each containing 100 mg HCQ twice per day for a total daily dose of 400 mg HCQ)
- Treatment 4 - Placebo (two capsules twice per day).
Subjects will visit the clinic on Day 1 and undergo baseline assessments, including:
- RAPID-3
- JC 66/68
- ACR20
- CDAI-RA
- FACIT-F
- HAQ-DI
- AE
- Concomitant medication review
- Weight/BMI
- Physical exam
- Vitals
- ECG
- Safety blood collection
Subjects will then be supplied with their first 28-day supply of their allocated treatment and will be set up with and instructed on the use of an electronic patient reported outcome (ePRO) either web based or using an app on the subject's personal device. The ePRO will be used daily by the subject to record pain, joint stiffness, tiredness, and use of other pain medication for the control of pain associated with arthritis.
Every 4 weeks, subjects will return to the clinical to undergo the same assessments and to receive the next 28-day supply of their allocated treatment. At 24 weeks, subjects will take their final dose prior to their return to the clinical for the final time (and will not receive another supply of the treatment) where they will undergo the same assessments as well as a final OCT eye exam, and subjects in the MRI sub-study will undergo a final MRI.
- Conditions
- Rheumatoid Arthritis
- Being tested
- IHL-675A, Cannabidiol, Hydroxychloroquine, Placebo
- Keywords
- Arthritis, MRI, RA, Rheumatoid Arthritis, Pain, Fatigue, RAMRIS, RAPID-3, Cannabidiol, CBD, Hydroxychloroquine, HCQ, Placebo, IHL-67A, Incannex, Joint pain, Stiffness
- Medical subject headings
- Arthritis, Rheumatoid, Arthritis, Pain, Fatigue, Arthralgia
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
IHL-675ADrug
Combination product containing CBD and HCQ UniGel™ technology by ProCaps®. IHL-675A consists of a solid, film coated HCQ tablet that is contained within a CBD oil solution gel cap. Each IHL-675A gel cap contains 75 mg of CBD and 100 mg HCQ.
CannabidiolDrug
Also called CBD, Epidiolex, Epydiolex
Formulated using UniGel™ technology by ProCaps®. The CBD soft gel capsules contain 75 mg CBD oil solution. These capsules look identical to the IHL-675A UniGel™ capsules, to aid double-blinding
Also called HCQ, Plaquenil
Formulated using UniGel™ technology by ProCaps®. The soft gel capsules each contain a 100 mg HCQ tablet. These capsules look identical to the IHL-675A UniGel™ capsules to aid double-blinding.
PlaceboDrug
Formulated using UniGel™ technology by ProCaps®. The soft gel capsules contain the inactive ingredients of the IHL-675A capsules and no active ingredients. These capsules look identical to the IHL-675A UniGel™ capsules to aid double-blinding.
| Study group | Role | What they receive |
|---|---|---|
| IHL-675A | Experimental | 150 mg CBD, 200 mg HCQ: two soft gel capsules each containing 75 mg CBD and 100 mg HCQ twice per day for a total daily dose of 300 mg CBD and 400 mg HCQ Receives: Drug: IHL-675A |
| Cannabidiol | Active comparator | 150 mg: two capsules each containing 75 mg CBD twice per day for a total daily dose of 300 mg CBD Receives: Drug: Cannabidiol |
| Hydroxychloroquine | Active comparator | 200 mg: two capsules each containing 100 mg HCQ twice per day for a total daily dose of 400 mg HCQ Receives: Drug: Hydroxychloroquine |
| Placebo | Placebo comparator | Two capsules twice per day Receives: Drug: Placebo |
What is being measured
The primary outcome is the main question the study is designed to answer.
Change in pain and function
Routine Assessment of Patient Index Data 3 (RAPID-3) questionnaire to assess pain and function in arthritis patients.
RAPID-3 is a pooled index of the 3 patient-reported American College of Rheumatology RA Core Data Set measures: function, pain, and patient global estimate of status. Each of the 3 individual measures is scored 0 to 10, for a total of 30. Disease severity may be classified on the basis of RAPID3 scores: >12 = high; 6.1-12 = moderate; 3.1-6 = low; < or =3 = remission
Measured: 24 weeks
Secondary outcomes (22)
Safety and tolerability - Incidence of the use of concomitant medications for pain management
Incidence of the use of concomitant pain medications for the treatment of arthritis related pain. Subjects will report the use of rescue pain medication for pain associated with arthritis using an electronic patient reported outcome (ePRO) on their personal device.
Measured: 4, 8, 12, 16, 20 and 24 weeks
Safety and tolerability - Vital signs - Temperature
Change from baseline in body temperature (°C)
Measured: 4, 8, 12, 16, 20 and 24 weeks
Safety and tolerability - Vital signs - Pulse Rate
Change from baseline in pulse rate (BPM)
Measured: 4, 8, 12, 16, 20 and 24 weeks
Safety and tolerability - Vital signs - Respiratory Rate
Change from baseline in respiratory rate (RPM)
Measured: 4, 8, 12, 16, 20 and 24 weeks
Safety and tolerability - Vital signs - Blood Pressure
Change from baseline in systolic blood pressure (mmHg) and diastolic blood pressure (mmHg) to report change in blood pressure
Measured: 4, 8, 12, 16, 20 and 24 weeks
Safety and tolerability - 12-lead ECG
Change from baseline in 12-lead ECG results: PR interval, QRS, QTcF
Measured: 4, 8, 12, 16, 20 and 24 weeks
Safety and tolerability - Adverse Events
Assess the number of treatment emergent adverse events (TEAEs) and serious treatment emergent adverse events associated with the dosing of IHL-675A in comparison to the active comparators (CBD and HCQ), and placebo.
Measured: 4, 8, 12, 16, 20 and 24 weeks
Safety and tolerability - OCT Eye Exam
Changes from baseline in retinopathy as assessed by Optical Coherence Tomography (OCT) eye exam
Measured: 24 weeks
Safety and tolerability - The Columbia Suicide Severity Rating Scale (C-SSRS)
Change from baseline in suicidality assessed by The Columbia Suicide Severity Rating Scale (C-SSRS). The C-SSRS is an instrument that measures suicidal ideation and behaviour. The ideation subscale evaluates severity on a 5-point scale, ranging from "wish to be dead" to "active suicidal ideation with specific plan and intent." The behaviour subscale assesses various categories of suicidal behaviour. Higher scores on the C-SSRS represent more severe levels of suicidal ideation or behaviour. Lower scores, therefore, indicate a better outcome as it represents lower levels of suicidal ideation or behaviour.
Measured: 24 weeks
Change in pain - Routine Assessment of Patient Index Data 3 (RAPID-3)
Change in pain from baseline. Assessed by change in Routine Assessment of Patient Index Data 3 (RAPID-3) score relative to baseline. RAPID-3 is a composite score that measures physical function, pain, and patient global assessment on a scale from 0 to 30, with higher scores indicating worse outcomes (i.e., more pain and disability). A decrease in the RAPID-3 score from baseline represents an improvement.
Measured: 4, 8, 12, 16 and 20 weeks
Change in fatigue - Functional Assessment of Chronic Illness Therapy - Fatigue (FACIT-F)
Change in fatigue from baseline. Assessed by change in the Functional Assessment of Chronic Illness Therapy - Fatigue (FACIT-F) score. FACIT-F is a 40-item measure that assesses self-reported fatigue and its impact upon daily activities and function on a scale from 0 to 160. Higher scores indicate better outcomes (i.e., less fatigue). An increase in the FACIT-F score from baseline represents an improvement.
Measured: 4, 8, 12, 16, 20 and 24 weeks
Change in quality of life - Health Assessment Questionnaire - Disability Index (HAQ-DI)
Change in quality of life from baseline. Assessed by change in Health Assessment Questionnaire - Disability Index (HAQ-DI) score. The HAQ-DI assesses a patient's level of functional ability on a scale from 0 to 3. Higher scores indicate worse outcomes (i.e., greater disability). A decrease in the HAQ-DI score from baseline represents an improvement.
Measured: 4, 8, 12, 16, 20 and 24 weeks
Change in disease activity - ACR20
Change in disease activity from baseline. Assessed by change in American College of Rheumatology-20 (ACR20) response rate. The ACR response is scored as a percentage improvement, comparing disease activity at two discrete time points (usually baseline and post-baseline comparison). ACR20 is ≥ 20% improvement
Measured: 4, 8, 12, 16, 20 and 24 weeks
Change in disease activity - JC66/68
Change in disease activity from baseline. Assessed by change in joint swelling/tenderness count 66/68 (JC66/68). The 66/68 Joint Count evaluates 66 joints for swelling and 68 joints for tenderness and pain with movement. Note that the hip joints can be evaluated for tenderness only-not for swelling. The total score is composed of points that are based on the presence of pain and/or swelling in a joint
Measured: 4, 8, 12, 16, 20 and 24 weeks
Change in disease activity - CDAI-RA
Change in disease activity from baseline. Assessed by change in clinical disease activity index for rheumatoid arthritis (CDAI-RA) score. CDAI is based on the simple summation of the count of swollen/tender joint count of 28 joints along with patient and physician global assessment on VAS (0-10 cm) Scale for estimating disease activity. The CDAI has range from 0 to 76.
Measured: 4, 8, 12, 16, 20 and 24 weeks
Change in inflammatory serology - C-Reactive Protein (CRP)
Change in CRP levels from baseline. Assessed by the change in blood C-reactive protein (CRP) levels relative to baseline. CRP is a systemic marker of inflammation. The measurement is reported in milligrams per litre (mg/L). Higher levels of CRP typically indicate a higher level of systemic inflammation, so a decrease in CRP levels from baseline would generally indicate an improvement.
Measured: 4, 8, 12, 16, 20 and 24 weeks
Change in inflammatory serology - Erythrocyte sedimentation rate (ESR)
Change in ESR levels from baseline. This outcome is assessed by the change in blood erythrocyte sedimentation rate (ESR) levels relative to baseline. ESR is a systemic marker of inflammation. The measurement is reported in millimetres per hour (mm/hr). Higher ESR levels typically indicate a higher level of systemic inflammation, so a decrease in ESR levels from baseline would generally indicate an improvement.
Measured: 4, 8, 12, 16, 20 and 24 weeks
Change in tiredness
Change in tiredness from baseline. Assessed by an electronic patient reported outcome (ePRO). Subjects will be prompted daily to answer a set of 5 questions that will ask the patient about their pain, joint stiffness duration and severity, and tiredness, and to record the use of any concomitant medication for pain associated with arthritis.
Measured: 24 weeks
Change in pain (daily)
Change in pain from baseline. Assessed by an electronic patient reported outcome (ePRO). Subjects will be prompted daily to answer a set of 5 questions that will ask the patient about their pain, joint stiffness duration and severity, and tiredness, and to record the use of any concomitant medication for pain associated with arthritis.
Measured: 24 weeks
Change in joint stiffness duration
Change in joint stiffness duration from baseline. Assessed by an electronic patient reported outcome (ePRO). Subjects will be prompted daily to answer a set of 5 questions that will ask the patient about their pain, joint stiffness duration and severity, and tiredness, and to record the use of any concomitant medication for pain associated with arthritis.
Measured: 24 weeks
Change in joint stiffness severity
Change in joint stiffness severity from baseline. Assessed by an electronic patient reported outcome (ePRO). Subjects will be prompted daily to answer a set of 5 questions that will ask the patient about their pain, joint stiffness duration and severity, and tiredness, and to record the use of any concomitant medication for pain associated with arthritis.
Measured: 24 weeks
Effect of IHL-675A on cytokines
Change in cytokines IL-1β, IL-6, TNF levels compared to pre-dose levels.
Measured: 12 and 24 weeks
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted12 Jul 2023
- Study start22 Nov 2023
- Primary completion28 Oct 2024
- Study completion28 Oct 2025
Why it stopped: Recruitment challenges
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Rheumatoid ArthritisStudies 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
- Double blind
- Who is masked
- Participant, Investigator
- Enrolment
- 20 participants (actual)
Sponsor and investigators
- Lead sponsor
- Incannex Healthcare Ltd
- Sponsor type
- Industry (pharma, biotech, devices)
- Responsible party
- Sponsor
- Investigators
- Stephen Hall, Prof., Principal investigator, Emeritus Research
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05942911
- Sponsor's protocol ID
- IHL675ARAPhII
- Acronym
- CHAPPII
- Status last verified
- Mar 2026
- First submitted
- 15 May 2023
- Last updated
- 27 Mar 2026
- Results posted
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Study at a glance
From the registry record, last updated by the sponsor on 27 Mar 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Phase II, Blinded, Randomised, Placebo Controlled Clinical Trial to Determine the Safety and Effect on Pain and Function According to RAPID-3 of IHL-675A in Patients With Rheumatoid Arthritis
- ClinicalTrials.gov ID
- NCT05942911
- Acronym / sponsor ID
- CHAPPII / IHL675ARAPhII
- Conditions
- Rheumatoid Arthritis
- Keywords
- Arthritis, MRI, RA, Rheumatoid Arthritis, Pain, Fatigue, RAMRIS, RAPID-3
- Phase
- Phase 2
- Study type
- Interventional
- Recruitment status
- TerminatedReason stopped: Recruitment challenges
- Enrolment
- 20 participants (actual)
- Lead sponsor
- Incannex Healthcare LtdIndustry (pharma, biotech, devices)
- Study start
- 22 Nov 2023 (actual)
- Primary completion
- 28 Oct 2024 (actual)
- Study completion
- 28 Oct 2025 (actual)
- First posted
- 12 Jul 2023 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The goal of this randomised, double-blind, placebo-controlled Phase II clinical trial is to assess the safety and effect of of IHL-675A in rheumatoid arthritis patients on pain, and function according to RAPID-3.
128 volunteers will be enrolled and randomised to one of four treatments (32 subjects per treatment). Each treatment will be self-administered twice daily for 24 weeks.
The four treatments are:
- Treatment 1 - IHL-675A
- Treatment 2 - CBD
- Treatment 3 - HCQ
- Treatment 4 - Placebo
Detailed description
This is a Phase II, double-blind, randomised, placebo-controlled clinical trial to assess the safety and effect of IHL-675A (a combination of cannabidiol (CBD) and hydroxychloroquine (HCQ)) on pain and function using the RAPID-3 patient reported outcome (PRO) in patients with Rheumatoid Arthritis. This study will compare IHL-675A to the component drugs, CBD and HCQ, as well as a placebo. The study will aim to enrol a total of 128 subjects across the 4 treatment groups (32 per group).
The study will also assess structural changes in joint damage in an MRI sub-study using the Rheumatoid Arthritis Magnetic Resonance Imaging Score (RAMRIS).
During the 28-day screening period, subjects will provide information on their demographics, medical history, history of inflammatory conditions and weight/body mass index (BMI). A physical exam, vital signs, and 12-lead ECG will be conducted. Urine and blood samples will be collected for urinalysis, to assess for pregnancy, the presence of illicit drugs and to detect any clinically significant outcomes that would exclude subjects from being eligible for the clinical trial and to measure erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) levels. A series of questionnaires will be conducted to assess eligibility and mental health status.
These questionnaires will be:
- RAPID-3
- JC 66/68
- Health Assessment Questionnaire-Disability Index (HAQ-DI)
- Columbia-Suicide Severity Rating Scale (C-SSRS) Subjects will also undergo an optical coherence tomography (OCT) eye examination to rule out retinopathy.
Subjects who have consented to the MRI sub-study will also undergo an MRI during screening.
Once the participant is deemed eligible to be enrolled in the study, the baseline visit will be performed and the participant will be randomised into one of the four treatment groups:
- Treatment 1 - IHL-675A (150 mg CBD, 200 mg HCQ: two soft gel capsules each containing 75 mg CBD and 100 mg HCQ twice per day for a total daily dose of 300 mg CBD and 400 mg HCQ)
- Treatment 2 - CBD (150 mg: two capsules each containing 75 mg CBD twice per day for a total daily dose of 300 mg CBD)
- Treatment 3 - HCQ (200 mg: two capsules each containing 100 mg HCQ twice per day for a total daily dose of 400 mg HCQ)
- Treatment 4 - Placebo (two capsules twice per day).
Subjects will visit the clinic on Day 1 and undergo baseline assessments, including:
- RAPID-3
- JC 66/68
- ACR20
- CDAI-RA
- FACIT-F
- HAQ-DI
- AE
- Concomitant medication review
- Weight/BMI
- Physical exam
- Vitals
- ECG
- Safety blood collection
Subjects will then be supplied with their first 28-day supply of their allocated treatment and will be set up with and instructed on the use of an electronic patient reported outcome (ePRO) either web based or using an app on the subject's personal device. The ePRO will be used daily by the subject to record pain, joint stiffness, tiredness, and use of other pain medication for the control of pain associated with arthritis.
Every 4 weeks, subjects will return to the clinical to undergo the same assessments and to receive the next 28-day supply of their allocated treatment. At 24 weeks, subjects will take their final dose prior to their return to the clinical for the final time (and will not receive another supply of the treatment) where they will undergo the same assessments as well as a final OCT eye exam, and subjects in the MRI sub-study will undergo a final MRI.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Double blind (participant, investigator)
- Number of arms
- 4
| Arm | Type | Receives |
|---|---|---|
| IHL-675A | Experimental | Drug: IHL-675A150 mg CBD, 200 mg HCQ: two soft gel capsules each containing 75 mg CBD and 100 mg HCQ twice per day for a total daily dose of 300 mg CBD and 400 mg HCQ |
| Cannabidiol | Active comparator | Drug: Cannabidiol150 mg: two capsules each containing 75 mg CBD twice per day for a total daily dose of 300 mg CBD |
| Hydroxychloroquine | Active comparator | Drug: Hydroxychloroquine200 mg: two capsules each containing 100 mg HCQ twice per day for a total daily dose of 400 mg HCQ |
| Placebo | Placebo comparator | Drug: PlaceboTwo capsules twice per day |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (25 listed)
- Must have given written informed consent, before any study-related activities are carried out and must be able to understand the full nature and purpose of the trial, including possible risks and adverse effects
- Has been diagnosed with RA and on stable treatment for RA for at least 3 months prior to the screening visit
- Subject has a RAPID-3 score of >4.5 at screening
- Male or female, aged 18 or older inclusive at the screening visit
- Body mass index (BMI) of 18 to 32 kg/m2, inclusive, at screening
Key exclusion criteria (24 listed)
- Subjects will be excluded from the study if there is evidence of any of the following at screening.
- Subjects will be excluded from the study if there is evidence of any of the following at screening.
- Known hypersensitivity to any of the study drug ingredients (cannabis products, sesame oil, hydroxychloroquine or chloroquine)
- History of any clinically significant (in the opinion of the investigator) disorder within the last 3 months including cardiovascular (cardiac disease or arrythmias), haematologic, pulmonary, hepatic, renal, or gastrointestinal (such as cholecystitis, Gilbert's syndrome) disorders, or connective tissue, uncontrolled endocrine/metabolic, oncologic (within the last 5 years), neurologic, or any disorder within the last 3 months that may prevent the successful completion of the study or influence the absorption, distribution, metabolism, excretion or action of the study drug (in the opinion of the investigator). Note: a history of fully resolved childhood asthma is not exclusionary; a history of cholecystectomy is not exclusionary
- Family history of QT issues
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 |
|---|---|---|
| IHL-675ACombination product containing CBD and HCQ UniGel™ technology by ProCaps®. IHL-675A consists of a solid, film coated HCQ tablet that is contained within a CBD oil solution gel cap. Each IHL-675A gel cap contains 75 mg of CBD and 100 mg HCQ. | Drug | IHL-675A |
| CannabidiolAlso: CBD, Epidiolex, EpydiolexFormulated using UniGel™ technology by ProCaps®. The CBD soft gel capsules contain 75 mg CBD oil solution. These capsules look identical to the IHL-675A UniGel™ capsules, to aid double-blinding | Drug | Cannabidiol |
| HydroxychloroquineAlso: HCQ, PlaquenilFormulated using UniGel™ technology by ProCaps®. The soft gel capsules each contain a 100 mg HCQ tablet. These capsules look identical to the IHL-675A UniGel™ capsules to aid double-blinding. | Drug | Hydroxychloroquine |
| PlaceboFormulated using UniGel™ technology by ProCaps®. The soft gel capsules contain the inactive ingredients of the IHL-675A capsules and no active ingredients. These capsules look identical to the IHL-675A UniGel™ capsules to aid double-blinding. | Drug | Placebo |
Primary outcome
Change in pain and function
Time frame: 24 weeks
Routine Assessment of Patient Index Data 3 (RAPID-3) questionnaire to assess pain and function in arthritis patients. RAPID-3 is a pooled index of the 3 patient-reported American College of Rheumatology RA Core Data Set measures: function, pain, and patient global estimate of status. Each of the 3 individual measures is scored 0 to 10, for a total of 30. Disease severity may be classified on the basis of RAPID3 scores: >12 = high; 6.1-12 = moderate; 3.1-6 = low; < or =3 = remission
22 secondary outcomes
Safety and tolerability - Incidence of the use of concomitant medications for pain management
Time frame: 4, 8, 12, 16, 20 and 24 weeks
Safety and tolerability - Vital signs - Temperature
Time frame: 4, 8, 12, 16, 20 and 24 weeks
Safety and tolerability - Vital signs - Pulse Rate
Time frame: 4, 8, 12, 16, 20 and 24 weeks
Safety and tolerability - Vital signs - Respiratory Rate
Time frame: 4, 8, 12, 16, 20 and 24 weeks
Safety and tolerability - Vital signs - Blood Pressure
Time frame: 4, 8, 12, 16, 20 and 24 weeks
Safety and tolerability - 12-lead ECG
Time frame: 4, 8, 12, 16, 20 and 24 weeks
Safety and tolerability - Adverse Events
Time frame: 4, 8, 12, 16, 20 and 24 weeks
Safety and tolerability - OCT Eye Exam
Time frame: 24 weeks
Safety and tolerability - The Columbia Suicide Severity Rating Scale (C-SSRS)
Time frame: 24 weeks
Change in pain - Routine Assessment of Patient Index Data 3 (RAPID-3)
Time frame: 4, 8, 12, 16 and 20 weeks
Change in fatigue - Functional Assessment of Chronic Illness Therapy - Fatigue (FACIT-F)
Time frame: 4, 8, 12, 16, 20 and 24 weeks
Change in quality of life - Health Assessment Questionnaire - Disability Index (HAQ-DI)
Time frame: 4, 8, 12, 16, 20 and 24 weeks
Change in disease activity - ACR20
Time frame: 4, 8, 12, 16, 20 and 24 weeks
Change in disease activity - JC66/68
Time frame: 4, 8, 12, 16, 20 and 24 weeks
Change in disease activity - CDAI-RA
Time frame: 4, 8, 12, 16, 20 and 24 weeks
Change in inflammatory serology - C-Reactive Protein (CRP)
Time frame: 4, 8, 12, 16, 20 and 24 weeks
Change in inflammatory serology - Erythrocyte sedimentation rate (ESR)
Time frame: 4, 8, 12, 16, 20 and 24 weeks
Change in tiredness
Time frame: 24 weeks
Change in pain (daily)
Time frame: 24 weeks
Change in joint stiffness duration
Time frame: 24 weeks
Change in joint stiffness severity
Time frame: 24 weeks
Effect of IHL-675A on cytokines
Time frame: 12 and 24 weeks
Results and safety
The study was stopped early (reason given: Recruitment challenges). Results are not available in the source record.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 27 Mar 2026.
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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.
Stephen Hall, Prof. principal investigator
Emeritus Research
10 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 IHL-675A, Cannabidiol and Hydroxychloroquine in people with Rheumatoid Arthritis, run by Incannex Healthcare Ltd at 10 sites in Australia.
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 25 inclusion and 24 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: stopped early, as of the sponsor's last update on 27 Mar 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 10 sites in Australia. 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?
The study was stopped early (reason given: Recruitment challenges). Results are not available in the source record.
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 in pain and function (time frame: 24 weeks). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
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 27 Mar 2026.