Adderall potentiates weed, but weed doesn't potentiate adderall, so it's safe to mix. Alcohol and Adderall potentiate each other, so adjust the doses accordingly. Alcohol and weed don't really do anything more together than their individual effects combined. Xanax and weed go well together, but there's no actual interactions. Xanax and alcohol go well together, but the combination can result in an overdose. Adderall and Xanax counteract each other, so both will be significantly weakened. I suggest taking out either adderall or xanax, because using both will pretty much be the same as using neither. Do not redose on any of the drugs after taking the first, because your judgement will be significantly impaired, especially because of the alcohol and Xanax. Best of luck, stay safe