Heroin can give you a feeling of comfort and happiness. It can also make you feel like the world has slowed down. People on heroin may think slowly and might move slowly.

Image of an eye with a very small pupil.”Photo by Wikimedia Commons/Myosis

Heroin can make people feel sleepy, like they're in a dream.

Heroin makes the pupils in a person’s eyes get very small. A pupil is the black circle in the center of each eye.

People who inject (shoot up) heroin may have marks on the skin where the needle went in.

When heroin wears off, people might:

  • have pain in muscles and bones
  • get chills
  • throw up
  • be unable to sleep
  • feel nervous
  • feel itchy

NEXT: Effects of Heroin on Brains and Bodies