>>> Basic Drug Discussion
What quantities are you talking about, and what is your tolerance to these drugs like?
Mixing downers is dangerous. You're talking about taking an opioid, a benzo and alcohol - this can be deadly and has caught many people by surprise, even those with high tolerances. I really wouldn't advise it. You're also at more risk of redosing without realising what you're doing which adds to the dangers too.
Taking a stimulant such as Adderall with downers isn't inherently dangerous, but it could mask an overdose, leaving you in danger when it wears off. It would be easy not to realise how sedating your cocktail of drugs is if you're on Adderall too.
Make sure you don't take too much promethazine as that can cause delirium.
Overall no, this doesn't sound safe. Taking a cocktail of chemicals like this is never a good idea - more potential for interactions or general over-intoxication; mixing 3 CNS-depressants (codeine, Xanax and alcohol) can be fatal; Adderall might make matters worse by masking things. I'd save some of those for a different night if I were you.