Safety and Effect on Pain and Function According to RAPID-3 of IHL-675A in Patients With Rheumatoid Arthritis

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.