VICE presents an immersive and personal feature film about the fentanyl crisis in Canada told from the perspective of a community of drug users.

This video has been edited from its original version due to privacy concerns surrounding one of its subjects.

Fentanyl is prescribed to treat severe pain.

The most common side-effects are feeling sick, constipation, and feeling sleepy. If you start to feel extremely sleepy or your breathing becomes slow or shallow, you should contact your doctor straightaway.

Fentanyl is likely to affect your reactions and ability to drive. It may be an offence to drive while affected. Do not drive until you know how you react.