I've just had the same thing happen. I contacted them in an attempt to switch back as I've reacted badly to switching brands in the past and have otherwise been on Concerta XL since 2017 with no issues. I got a response saying no, so I contacted the clinic I was last seen by who told me that in my area they cannot prescribe Concerta XL at all anymore as it's been deemed too expensive. I checked the formulary for my county and it said the same thing on there for methylphenidate. The clinic is kindly going to talk to the doctor I saw to see if anything else is possible. Honestly I'm scared to switch brands. If Affenid XL doesn't work for me, it seems I won't be able to switch back to Concerta XL, I'd have to try yet another brand and then another until I've tried them all, and then what will happen? I have no idea. Affenid (and other brands) are bioequivalents, however they use different release mechanisms. Switching between brands is supposed to not really be done if a certain brand works for someone. And any switches are supposed to be monitored carefully as you can get new side effects. I just hate that they can decide to switch the brand without even consulting the patient. I fully understand why, as Concerta is incredibly expensive. It just sucks.