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

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

Heroin makes the pupils (the black circle in the center of each eye) get very small.

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

Heroin can be addictive no matter if it's injected, smoked, or snorted. People who get addicted to heroin need to keep taking it to feel normal and may take more and more of it to get the same high.

When heroin wears off, people might:

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