Posted 11/23/2019 6:59 AM (GMT -7)
I've switched from brandnames asacol hd, to brandnanes lialda, to generic asacol hd, to generic lialda and had no issues at all among those various switches. Ancedotaly, some have reported issues when switching between meds. Doctors and pharmacists will say there's little to no difference among them. There's no back to back clinical studies to prove or disprove those claims.
I'd try it, not worry about it, and file an appeal to switch back to brandnames if you have any troubles afterwards.