A couple things you may want to consider-
Regular (tablet) Adderall has a half life of 6 hours, therefore taking it just before your classes may be helpful (once). I would also start with half the dosage and work up, because adderall builds a tolerance quickly, I would start below and go up.
If you do want to "come down" drink orange juice.
You can take adderall with food, so if your worried about body mass, take it, (wait about 10-20 min) and then drink a heafty protein shake, alternately you can get a normal shake in, crush the tablet and mix it in. (a similar strategy mothers use to get their children to take adderall)....
Adderall speeds up your metabolism, so you are processing things faster, however note that you need to stay hydrated on adderall, because it also dehydrates... with that said you can mix in some hydrolyzed protein or bcaas.
I would vote for BCAAs or EAAS.. and this is why:
Amphetamines are -amine salts. And studies show that the blood pH greatly determines how effective they are- if you drink basic beverages such as milk, sodium bicarbonate, calcium carbonate, etc. you will increase the bioavailability and the length of time it is effective in the body since amines thrive in a pH basic environment. However if your pH is slightly acidic, (ie drinking OJ) it would deactivate the amines, and excrete them faster.
In regards to mass you will lose: both fat and muscle, however the lower your BF gets, the more muscle it will eat.
I would not switch to stratterra, there have been reports of unusual behavioral patterns developing in adults including risk for depression, so if youre on anything else (ie: test) which also increases those risk factors I would avoid it.
Like Lacradocious suggested: I would suggest that you only take it on an "as needed" basis. It would still be effective, and it would lessen the side effects, both stim based and dopamine based ones.
Amicold:
you are incorrect. Pharmaceuticals DO make methamphetamine under the name Desoxyn.
one more thing to note: there have been reports based on anecdotal evidence that brand name adderall is different than generic. Although the chemicals are the same, and the ratios are correct, some children have strange reactions to the fillers in the generic tabs. With that said, brand adderall is a smoother drug. However you can also switch to Dexedrine which simply Dextroamphetamine salt, while adderall is a mix of Levo and Dextro amphetamine salts.