| https://clinicaltrials.gov/ct2/show/ | Clinical Disease Activity With Long Term Natalizumab Treatment | |
| https://clinicaltrials.gov/ct2/show/ | Real-world Outcomes on Tecfidera (BG00012, Dimethyl Fumarate) Post-Tysabri (BG00002, Natalizumab) | |
| https://clinicaltrials.gov/ct2/show/ | Ireland Natalizumab (TYSABRI) Observational Program | |
| https://clinicaltrials.gov/ct2/show/ | Observational Study of Tysabri in Early Relapsing-Remitting Multiple Sclerosis in Anti-JC Virus Antibody Negative Participants | |
| https://clinicaltrials.gov/ct2/show/ | A Proof of Concept Study to Evaluate the Effectiveness of Tysabri in Relapsing Remitting Multiple Sclerosis (RRMS) Patient Bladder Function | |