My prescribed adderall is extremely finicky So I just wanted to know if there is an explanation for why my adderall tends to work better on some days than others. 

What are factors (besides tolerance) which can mitigate the uptake and efficacy of the drug? 

I always take it on an empty stomach when I wake up. Usually I take two 20mg XR since 20mg does absolutely nothing for me therapeutically. I've been taking it for three months; I started at 15mg XR once a day and increased to 20mg once a day on the second month. Psych refuses to increase dosage further despite my requests. 

I have been diagnosed with moderate-severe ADHD-combined type. I feel that my dopamine levels are really unstable day to day. I have chronic digestion issues which I suspect may have some impact on uptake or dopamine levels. 

If more info is necessary I can provide. 
