I don't have to look up anything son, I'm the specialist and you're the dude not knowing what you're talking about so you have to provide the quotation, which you haven't, because there is no quotation. I'm probably wrong to waste my time with you but I'll do it for other people reading this:
Speedball is basically taking a deadly dose of Heroin and relying on the cocaine to dodge the respiratory depression. Since the cocaine wears off sooner, you might die from the opioid but if you keep re-dosing the cocaine, you will not. First of all, taking a deadly dose of Heroin is idiotic, regardless of the circumstance. All the cocaine does is it actually PREVENTS the overdose and respiratory depression, so the combination of both is much more beneficial than taking the deadly dose of Heroin alone, after which you certainly die!
I'm through with this. You know nothing man.