I'm willing to believe it was Adderrall until proven otherwise. As a doctor, I can say that not all of the 'banned substances' in sports have direct on-field performance-enhancing benefits. Some, like adderall, are mostly used for alertness, studying, or to get high. Could be recreational, could be to study game tape. Still, it's directly chemically related to an illegal substance, and is a HIGHLY controlled medication, and is clearly disallowed by the league's policy.
Some, like steroids, lead to direct on-field benefits.
Some, like spironolactone, are actually widely-used medications that happen to have indirect effects on hormonal balance. Spironolactone, for instance, is a testosterone antagonist, which is to say that it opposes the action of testosterone in the body. It is a blood pressure medication with no direct evidence that it legitimately increases on-field performance. Still, it is banned, and players get in trouble for using it.
They're all clearly rules violations. They all carry a 4-game penalty. They're all boneheaded mistakes. But I lose a lot more respect for athletes who take drugs for direct on-field benefit than I do for other banned substances, and I'm willing to wait and see.