I'm really sorry to hear that. See, that's a person who got a bad diagnosis. Anyone who takes the entire scrip and tries to get high on Adderall likely does not have ADD. I take Adderall and have zero urge to abuse it. I take it just as it is prescribed.... sometimes even a lot less. I routinely skip days when I feel the ADD is in check.
The brain is a funny thing. If you actually need a med, it goes to the right portion of your brain. If you don't, the med goes to a pleasure center instead. Same with opiates. If you have real pain, opiates go to the place that suppresses that pain. If you don't have pain, it gets you high.
That psych was a quack who gave out a bad diagnosis and unfortunately your brother paid the price.
Genuinely sorry to hear your brother went down so hard.
And no, I don’t find Prozac or Xanax to be helpful, never took a Xanax in my life. Took Zoloft for post partum depression and during my unwanted divorce. Now I just take migraine meds.