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What Is Heroin, and How Does It Affect the Body?
Heroin is an illegal opioid made from morphine. It can be injected, smoked, or snorted, and it quickly produces a rush of pleasure followed by drowsiness. Over time, the brain adapts, and the person needs more to feel the same effect and feels sick without it.
Heroin is also increasingly mixed with fentanyl, which raises the risk of overdose because users often cannot tell how strong a dose is. If someone may be overdosing, call 911, and give naloxone if you have it.
Signs of Heroin Addiction
Signs can include:
- Needing more heroin to get the same effect
- Withdrawal symptoms such as aches, sweating, vomiting, diarrhea, and anxiety
- Strong cravings and failed attempts to stop
- Drowsiness, small pupils, or confusion
- Pulling away from family, friends, and responsibilities
- Using even when it causes harm
If you see these signs in yourself or someone you love, an assessment can help you decide what to do next.




