In its legal form, fentanyl is usually administered as a shot, dissolvable lozenges, or even as a patch that sticks to skin. On the streets, however, illegally used fentanyl comes in a powdered form that people can mix into virtually anything without it being seen. There is no real way to know if the drugs you buy are laced with fentanyl unless they are tested in a specialized lab setting, which leaves you vulnerable to serious side effects.
