People with IBD (Crohn's and ulcerative colitis) where I live are being required to switch to a biosimilar. Biosimilars are not the same as generic versions. They are not identical.
I am on Entyvio for ulcerative colitis. as far as I can tell there is no biosimilar for Entyvio, but I am sure it is just a matter of time.
The reason for the switch is cost saving. Have you switched? Did it go ok? It is a bit scary to me as I am in my first really good remission in literally decades on the Entyvio and going backwards would be devastating.