Hello, my girlfriend and I are doing hard drugs for the last time, so we have decieded that we will be doing all the drugs that we have wanted to try, one being Heroin. I have done opiates in the past, and need around 40mg (IV) of oxycodone to get a decent high. My girlfriend has no tolerence to opiates, so how much should we do the first time? We plan on buying 2 g, and I know that is WAY too much. I have done a lot of research and haven't got a straight answer. What seems like an average IV dose for the first time using POWDERED heroin? Also I will be trying a speedball. How much of each should I put in for that? Please let me know ASAP.