...a long time ago, a Pharmacist in the business for years told me that generic were "ok" BUT that if someone had been on the "brand name" meds for a while and then switched to generic, they would notice.
I have advised Pharmacist when first started going there in 2016 that I preferred Name Branch and if any extra cost I would pay, but little by little, as my spouse's numerous pills, they have been replacing name brand with generic. Also I was old the manufacturer of the name brand Clonazepam/Rivotril in Canada no longer produces them so each month it seems to be from a different manufacturers - and another pharmacy told me they "shop around" for the cheapest price they can get when purchasing the drugs! Definitely the "fillers" and coatings/dyes etc. can vary from one manufacturer to another and for them to state : it's the SAME drug means nothing if we are allergic to the non-medicinal ingredients! Ugh!