^ pretty much. Euphoria + alertness is awesome mixed with a benzo to break the tension from speed. Even speedballing is fun but the opiates can overpower the stimulants if you overdo it like I did (I was a bit suicidal at the time though kinda wanted to test my limits to see what happened) and if you nod on the stims your heart rate might slow down but not to the same degree it would without them. When you're awake and not getting enough oxygen you can force yourself to breathe harder. If you're asleep you can't control your breathing, and opiates block the sensation your brain gets when you need air. The faster your heart beats the more air you need.
Basically I was just starting to fuck with opiates at the time, and I wanted to die without making it totally obvious in the autopsy that was my goal. I wanted my parents to think the OD was accidental but I guess once the hydrocodone peak was over I woke up from the stimulants, sweaty and feeling like I almost drowned.. also went and vomited after.
Related to OP - xanax/ valium are administered during stimulant OD's. They actually slow down the heart, and stop seizures if one is occurring from say - a mega dose of meth.
Like the above poster said, not only do you get the sedation from the xanax, you get the awakeness/alertness of the meth. Very nice mix.
Opiates are ok to mix but know your tolerance and for God's sake don't take enough to nod. When you mix the two you get more euphoria but you don't get drowsy until you cross that line where you nod and it gets even more dangerous the more shit you add on to the opiates. In other words I wouldn't add opiates to a mix of benzos and alcohol weed and meth.. maybe if the opiate dose wasreally low. The main danger with opiates is the shallow/labored breathing.
