Adderall 20 mg extended release

I was diagnosed with ADHD as a child and have just started to seek help for it. I am 24 yeas old a little over weight and have always had a very high tolerance to all medications I've ever taken. My doc perscribed me adderall (adderrall) xr 20mg I've been taking it two days and have noticed nothing. I can't even tell I have taken anything. I know it's not something that has to build up in your system to start working so my question is would I be ok to take two of the pills tomorrow? I do plan to call my doc and get his permission first of course but i was just wondering if anyone else takes a dose similar and if so how do you take them two in the morning or one in the morning one in the afternoon? Also did you start off on a lower dose first then work your way up or how did you start off? Thanks for any advice or help in advance.

[Sandman2]

     Whoaaaaa, your doctor should have covered all of this before you took your first pill :(
First, even with a high tolerance to meds, I think that if you did not have ADHD you would have noticed the adderall (adderrall).  It is speed to the normal population and you would expect some kind of a reaction along that avenue.
   Second, yes, 20mgs is a very small dose.  Doctors always start out with the smallest dose, wait for the patient's experience and based on that work up a step at a time.  Its the safest way to go.   The doc is expecting your call - make him earn his salary!   And no, don't take two pills without his permission, it could screw up whatever system he is using.
   Finally, as I said all of this is pretty standard stuff.     Two sites aimed at the adult ADD sufferer that you might want to check out are totallyadd.com and http://jeffsaddmind.com/for-first-time-visitors.
               Both sites are done by people with ADD.  totallyadd was actually a PBS special and consequently is a series of short videos.  Quite entertaining and useful.   Jeffs add mind really reflects him.  Has much more adult interaction.  Both are worth checking out.
   Hope this helps.  Best wishes!!