I have been on adderall 20mg twice per day for about 4 months now (take the generic 20mg orange amphetamine salt tabs made by barr) and just recently started feeling a tingling weird feeling on the left side of my head that is hard to describe. It is not painful but just feels weird and I wonder why I am getting it and whether i should be worried and if this is dangerous. I also started taking half of the 20's, so 10mg four times per day instead of just two of the 20 mg's per day about two weeks ago and didn't have the feeling when I first started doing this. Could this be the reason why? Also i just wanted to know if any of you have experienced this and would appreciate any comments and perspectives. Thank You.