don't mix it!!! I was crashing pretty hard and had no xanax (what i would usually take to come down), so i took 2 percocets...soon i was rushed to the hospital with a heart rate of 190 beats per minute, could not breath, my body became stiff because of my blood vessels working too hard. i got to the er and they injected me with a load of valium to slow my heart. doctors said it could have been any minute before my heart exploded. its been 6 months since then, i have not done coke or percs since and suffer from horrible panic attacks because of the trauma of that night................JUST A WARNING