An International, Multicenter, Randomized, Double-Blind, Double-Masked Study of the Efficacy and Safety of BCD-132 (JSC BIOCAD, Russia) Using an Active Reference Drug (Teriflunomide) for the Treatment of Patients With Multiple Sclerosis

Inclusion Criteria: 1. Written informed consent for participation in the study; 2. Male and female subjects, 18 to 60 years of age 3. Diagnosis of relapsing multiple sclerosis (according to 2017 revision to the McDonald Diagnostic Criteria for Multiple Sclerosis); 4. Documentary evidence that, at the time of signing the informed consent, the subject had: 1. at least 1 relapse within the last calendar year (12 months), or 2. 2 relapses within the last 2 years (24 months), or 3. at least 1 T1 gadolinium-enhanced brain lesion on MRI and 1 relapse within 2 calendar years (24 months) prior to signing the informed consent; 5. The subject must be neurologically stable for 30 days prior to signing the informed consent 6. Total EDSS score 0 to 5.5 inclusive 7. Positive anti-Varicella Zoster IgG antibodies according to screening test results; 8. Absence of suicidal ideation and behavior confirmed at screening according to C-SSRS score within 1 month prior to signing the informed consent 9. Willingness of both female and male patients and their sexual partners of childbearing potential to use reliable contraception Exclusion Criteria: Primary progressive MS; Duration of multiple sclerosis for more than 10 years with EDSS ≤2.0 according to screening assessments; Other disorders (besides multiple sclerosis), which could affect the assessment of symptom severity for the primary disease A relapse during screening period ; Use of systemic corticosteroids for 30 days prior to signing the informed consent; Disorders, besides multiple sclerosis, requiring long-term systemic therapy with corticosteroids and/or immunosuppressants; Heart failure (NYHA functional class III/IV); encephalopathy, lactic acidosis, MELAS syndrome), neuromyelitis optica, sarcoidosis; Diagnosis of HIV, hepatitis B, hepatitis C, or syphilis ; Increased TTG levels at least two times the upper limit of normal on screening tests; Suicidal ideation and/or behavior History of severe depression Pregnancy, breastfeeding, or intention to become pregnant at any point throughout the study period; Prior use of anti-B cell therapies Intolerance, including hypersensitivity to any component of BCD-132/teriflunomide, premedication drugs, or conditions in which the above drugs are contraindicated in the Investigator's opinion; History of severe allergic or anaphylactic reactions to humanized and/or murine monoclonal antibodies; History of progressive multifocal leukoencephalopathy Known alcohol or drug addiction or signs of current alcohol/drug addiction Inability to follow the procedures specified in the Protocol, as assessed by the Investigator; Contraindications to MRI and administration of gadolinium-based contrast agents: Any current or prior malignancies, except for successfully treated basal cell carcinoma and cervical carcinoma in situ Vaccination within 6 weeks prior to signing the informed consent \-