Drug users who inject and share needles run a high risk of HIV infection, as sharing a needle can mean that someone else's blood is injected in your body. This is a risk even if the needles looks clean and any blood is imperceptible to the human eye. If you do not share needles at all then your drug use will not put you at risk of HIV, whether the drugs you use are recreational illegal drugs, bodybuilding steroids or medication. HIV can also be passed in the same way via unclean tattooing needles or piercing equipment. Always check that all such equipment is sterilised and new needles used.