Who tried a generic extended-release methylphenidate instead of their usual?

My child had to switch from Medikinet removed to the Zentiva version. Teachers said the generic is hardly working at all.

Can it really be so much different? Both claim to have a 50 % instant-release part.

Medikinet removed has a similar curve as Ritalin LA with a stronger peak between hour 3 and 6. The Zentiva isn't even documented that well. German article with interesting comparison graphs: https://www.ppt-online.de/heftarchiv/2022/04/individuelle-adhs-therapie-mit-methylphenidat-*removed*praeparaten.html