Is Natalizumab Intake Considered As Chemotherapy?

Good day, I was diagnosed with RRMS on 2016 though I was experiencing the symptoms since 2011. I was on Betaferon for a year and a half. the diagnosis was changed to aggressive RRMS with a strong possibility of shifting to SPMS and I m using Tysabri at the moment. My question is regarding the drug itself, does the Natalizumab considered as chemo therapy? Thanks