Before injecting, people who inject drugs generally filter the mixture to be injected, in order to eliminate "insoluble particles".
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Before injection, PWID usually filter their mix to remove certain unwanted elements and prevent their needles from clogging.
The product to be injected -whether in powder, solid or tablet forme, must first be dissolved in water. It may also need to be heated to facilitate dissolution.
Injection drug use exposes to different types of complications:
Viral infections (HIV, HCV, etc), transmitted when sharing paraphernalia
Bacterial...