Study to Evaluate the Efficacy, Safety, and Tolerability of IMU-838 in Patients With Relapsing Multiple Sclerosis

Eligibility Criteria

• * Male or female patient (age ≥18 to ≤55 years).
• * Patients with an established diagnosis of MS according to 2017 McDonald Criteria.
• * Patients with RMS comprising of relapsing remitting MS (RRMS) and active secondary progressive MS, both defined according to Lublin criteria 1996 and 2014.
• * Active disease as defined by Lublin 2014 evidenced prior to Screening by:
• 1. At least 2 relapses in the last 24 months before randomization, or
• 2. At least 1 relapse in the last 12 months before randomization, or
• 3. A positive Gd+ MRI scan (brain and/or spine) in the last 12 months prior to randomization.
• * Willingness and ability to comply with the protocol.
• * Written informed consent given prior to any study-related procedure.
• * Patients with non-active secondary progressive MS and primary progressive MS.
• * Any disease other than MS that may better explain the signs and symptoms, including history of complete transverse myelitis.
• * Clinical signs or presence of laboratory findings suggestive for neuromyelitis optica (NMO) spectrum disorders or myelin oligodendrocyte glycoprotein (MOG)-IgG-associated encephalomyelitis
• * Any active and uncontrolled coexisting autoimmune disease, other than MS (except for type 1 diabetes mellitus and inflammatory bowel disease)
• * Use of experimental/investigational drug (with the exception ofCOVID-19 vaccines approved by emergency use authorization) and/or participation in drug clinical studies within 6 months prior to Screening
• * Previous or current use of MS treatments lifelong, or within a pre-specified time period.
• * Use of the pre-specified concomitant medications.
• * Clinically significantly abnormal and pre-specified lab values.
• * History of chronic systemic infections within 6 months before the date of informed consent.
• * Diagnosis or suspected liver function impairment, which may cause fluctuating liver function tests during this study.
• * Known history of nephrolithiasis or underlying condition with a strong association of nephrolithiasis.
• * History or clinical diagnosis of gout.
• * History or presence of any major medical or psychiatric illness
• * Substantial medical condition that could create undue risk to the patient, could affect adherence with the study protocol or could undesirably affect study outcomes