Document what time of day you give the medications, when the trouble starts, how long they slept, etc.
N* was on adderall and became WORSE! I stopped giving it to her. I explained to teachers and to docs -- NO DRUGS if N* herself didn't see an improvement. Finally found the right one on the third try.
Since many of the stimulants have a slow release factor, try to give the drug early enough in the day to allow it to fizzle out by bed time.