Substance education
Heroin.
Unpredictable strength and overdose risk; effective treatment is available.
Also known as Black tar, H, Smack. A name does not verify contents.
What it is
Heroin is an opioid that can cause nausea, itching, drowsiness and slowed breathing. Strength and added substances are unpredictable.
Sources & review notes
- Heroin
NIH / MedlinePlus · Accessed 2026-09-26 · Effects, dependence, overdose and treatment
Major risks
Overdose can deprive the brain of oxygen. Other depressants increase risk. Illegally made fentanyl can be present.
Dependence & health
Repeated use can cause dependence and addiction. Injection adds infection risks. Treatment may combine medication and behavioral support.
Sources & review notes
- Heroin
NIH / MedlinePlus · Accessed 2026-09-26 · Effects, dependence, overdose and treatment
Reduced alertness
Repeatedly drifting out of consciousness needs assessment, not an assumption that someone is tired after an event.
Sources & review notes
- Heroin
NIH / MedlinePlus · Accessed 2026-09-26 · Effects, dependence, overdose and treatment
Warning signs
Unresponsiveness or abnormal breathing is an emergency. Use available naloxone and follow emergency guidance.
Sources & review notes
- 5 Things to Know About Naloxone
CDC · Published/updated 2024-05-02 · Accessed 2026-09-26 · Recognition, response, repeat doses and access - Heroin
NIH / MedlinePlus · Accessed 2026-09-26 · Effects, dependence, overdose and treatment
Interaction records
No published pair records are available for this substance. Missing information does not mean a combination is safe.
This resource provides general education, not medical advice or personal clearance to use a substance. No drug or combination is risk-free. For an emergency, call 911.