How do i know if my adderall (dextroamphetamine and racemic amphetamine) xr dose is to high or to low?

Depends: To tell you that you just too much or too little of the medicine is the duration of your concentration/focusing. If you have severe anxiety, increased jitteriness or exhibit any i change in personality, then you have too much medication.

Clinically....: We usually determine the dose based on how it is working for you. Does it feel like it helps? How long is it lasting? Are you having any negative effects (side effects)? Those are the questions we ask and based on that, decide if you should be on more or less or something else. Discuss all these things with your md.