I used to shot up oxy. It was pretty much the same effect as shooting up heroin. It works in seconds. It was harder though because you have to get the pills, peel off the coating, break it down, add water, filter and inject. umm I am not sure what if any damage the oxy does to your veins. It is the needle that causes damage to your veins. The repeated use of a needle.
note to Velvet, in my case I shot up anything and everything I could get my hands on. I don't know if your reference to your friend being a creep was because he was an IV user or because of other things he did, but I did it because I am an addict who was lost, spiritually, emotionally and physically. I am clean 3 1/2 years now and I am not "lost" anymore. Some people's disease just takes them to a different bottom than others. We are all just humans struggling with our own issues. Patience and kindness are my way of life today.