The 'Wearing Off' Effect of DMT

Inclusion Criteria: Patients who attend the following criteria will be included: 1. Age ≥18; 2. Current resident of the country of interest (i.e., Germany, the UK, or the US); 3. Relapsing-remitting MS diagnosis confirmed by a clinician; 4. Currently taking at least one of the following DMTs for MS after the maintenance phase: ocrelizumab (Ocrevus®), natalizumab (Tysabri®), or ofatumumab (Kesimpta®); 5. Two or more consecutive ocrelizumab doses (Six or more consecutive natalizumab doses or Six or more consecutive ofatumumab doses); 6. Follow the approved dosing regimen (Ocrelizumab: every six months or Natalizumab: every month or Ofatumumab: every month); 7. Experienced reoccurring symptoms towards the end of the dosing cycle (i.e., the wearing off effect); 8. Willing and able to provide informed consent via a weblink, indicating they understand the study purpose and procedures and are willing to participate; 9. Able to read, understand, and communicate in English or German; 10. Willing and able to participate in a phone/web-based (remote) one-on-one interview, and to be audio-recorded; 11. Have an e-mail address and will have access to a computer or smartphone at the time of the interview to complete the electronic consent form. Clinicians who attend the following criteria will be included: 1. Currently practices in one of the target countries (i.e., Germany, the UK, or the US); 2. Is a licensed clinician with a specialty in neurology; 3. Has prescribed at least one of the following DMTs within the last year: ocrelizumab (Ocrevus®), natalizumab (Tysabri®), or ofatumumab (Kesimpta®); 4. Has treated at least 16 MS patients within the last month; 5. Is personally responsible for treatment decisions for their patients; 6. Has followed patients treating MS with any of the three DMTs for a. Two or more consecutive ocrelizumab doses or b. Six or more consecutive natalizumab doses. c. Six or more consecutive ofatumumab doses; 7. Has treated patients who have experienced specific reoccurring symptoms towards the end of the dosing cycle (i.e., the wearing off effect); 8. Willing and able to provide informed consent via a weblink, indicating they understand the study purpose and procedures and are willing to participate; 9. Willing and able to participate in a phone/web-based interview, and to be audio-recorded. 10. Able to read, understand, and communicate in English Exclusion Criteria: Patients will be excluded from the enrollment if: 1. Has a diagnosis of clinically isolated MS syndrome, primary progressive MS, or secondary progressive MS; 2. Currently participates in an interventional MS clinical trial. Clinicians will be excluded from the enrollment if are currently involved as a key opinion leader or receives funding from one of the drug manufacturers