For health reasons, I would recommend eating a good meal before taking adderall
. It tends to curb your appetite and make it harder to eat later on, which often results in one not eating much or even anything until the drug
has worn off. This doesn't help with focus or concentration, which is ostensibly why most people take prescription amphetamines, and in the long run is bad for personal health.
Antacids can prolong the duration of effects, but I don't think they should have much if any potentiating influence.
Taking vitamins and mood-boosting supplements (fish oils and the like) are also useful in conjunction with adderall, and even if you aren't taking adderall.
So basically, if you need to have an empty stomach for adderall to kick in effectively, be sure to eat a good meal beforehand and wait until you have digested before taking it. Then be sure to eat fruit, fruit & nut or protein bar, smoothies, or whatever nominally healthy thing you can get down your throat so you aren't short changing yourself whilst under the influence of its stimulating effects.