The two most important pieces of advice I can think of off hand (besides not doing it.) are, 1.) Be aware that once you start needles, there is nearly no way back. It becomes a fixation that most people never get over! The iv road has no u-turns, and leads straight to misery and despair. It's the fastest route to ruining your life 2.) If youre dead set on doing it, invest in a micron filter, theyre available online, for fairly cheap. Using cotton to filter is ineffective and as mentioned above, can lead to cotton feaver. I dont know what drug you plan on iv'ing, but please avoid shooting pills, I've seen people fuck up their arms in a very short period of time. But, if you dont adhere to that advice, and shoot pills anyways, at the very least, DO NOT cook your shots! Also, find a needle exchange, and use an unused needle everytime.. just google "needles after multiple uses", and you'll see why..
- Hopeless Soul