Hey, tooner! I am glad to hear you are very concerned about your brother. If he just has "anxiety," then that's something that might be treatable without meds.
I have taken many meds over the years, and now take Wellbutrin, Tegretol, and Klonopin. My recommendation is to take as few as possible. I was overmedicated by one doctor and I do believe the strong meds I was given, such as anti-psychotic drugs, have slowed my brain some. (I have Bipolar II disorder.)
I'm not sure your brother should just come off these meds, though. Meds are needed sometimes. Maybe he can at some point, though. I recommend that right now he also go into therapy, ideally with someone who can treat him without drugs. Then over time maybe he can get off of them. That's my take, anyway.