How Long Does Heroin Stay in Your System?
How long heroin and its metabolites are detectable in urine, blood, saliva, and hair, how the body processes heroin, and what factors change the detection window.
Drug Facts & Effects
Educational guides on how specific drugs affect the body and brain, and what to know about risk and detection.
Heroin vs. Fentanyl: What’s the Difference?
How heroin and fentanyl actually compare: origin, potency, onset and duration, why fentanyl is increasingly mixed into the heroin supply, and what that means for overdose risk.
How Long Does a Heroin High Last?
The real timeline of a heroin high, from onset to comedown, what factors change how long it lasts, and why fentanyl contamination has made the answer far riskier than it used to be.
How Drug Addiction Affects the Nervous System
How addictive drugs hijack the brain’s dopamine reward pathway, the difference between central and peripheral nervous system effects, why tolerance and withdrawal happen, and whether the nervous system can recover.