I don't know if this is the right place to post this question, but here goes. My brother died from drug overdose on 2/16/09. Autopsy was performed & I just got word that the cause of death has been determined. Acute combined intoxication of alprazolam w/oxycodone. Alprazolam found in his system was 0.46 mcg & oxycodone was 0.19 mcg. He was taking Xanax for anxiety disorder, but had no script for oxycodone. We were told he took 15 Percocet along with his other meds 12 hours before he died. My question: Are the numbers above toxic levels & if so, would 0.19 mcg be equivalent to 15 percocet?