hi!

i'm about to start taking adderall (ir) again, and have some questions about tolerance. i used to take 5mg, but find that i don't even feel anything on that dose any more. my doc is going to prescribe 10mg instead, but i'm wondering if it's just a matter of time before i don't feel the effects at that dose. my question is this: is there a normal therapeutic does that one achieves, and then doesn't need any more? or does the tolerance just happen eventually?

any info would be great..