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Heroin is a fast acting opioid that converts to morphine in the brain within minutes. Its clinical picture has not changed much in a century, but its risk profile has changed completely: in most of the United States, what is sold as heroin now contains fentanyl, and often contains no heroin at all.
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Someone can use from the same source for months, build a tolerance calibrated to that supply, and then receive a batch mixed differently. Because fentanyl is potent in milligram quantities and mixed by hand, batch to batch variation is enormous. This is why overdose can happen to an experienced person who did nothing differently, and why the old intuition that a regular user knows their dose no longer holds.
Practically, anyone using heroin today should be treated as someone using fentanyl of unknown strength. Naloxone in the house is not optional, and one dose is frequently not enough.
Overdose dominates the conversation, reasonably. But injection carries a distinct set of problems that often go untreated because people delay seeking care.
Constipation, dental deterioration, disrupted menstrual cycles, low testosterone and chronic sleep disruption are common and rarely discussed, and several of them persist into early recovery.
Symptoms usually begin within eight to twelve hours of the last dose, peak around days two and three, and largely resolve within about a week, though fentanyl in the supply frequently stretches that. Expect aching muscles and bones, restlessness that makes sitting still intolerable, sweating and chills, goosebumps, streaming nose and eyes, cramping, nausea, vomiting, diarrhea, insomnia and severe anxiety.
It is rarely fatal in a healthy adult. It is, however, the moment at which most attempts to stop collapse, and dehydration from persistent vomiting and diarrhea can become genuinely dangerous. Medically supervised withdrawal is not about comfort for its own sake; it is about the person still being there on day four.
Medication is the foundation, as it is for any opioid use disorder. Buprenorphine and methadone both substantially reduce mortality; methadone is often the better fit for the very high tolerance a fentanyl contaminated supply produces. Extended release naltrexone is an option once a person is fully opioid free.
Level of care matters more here than with most substances, because environment is so often the deciding factor. Someone whose housing, social circle and daily routine are organized around use rarely succeeds by attending groups a few evenings a week. Medically supervised detox followed by residential treatment puts distance between the person and the cues, and gives medication time to stabilize before the world comes back. Stepping down through intensive outpatient and then continuing outpatient care is what makes the gain durable.
Some do. Rates of sustained recovery are considerably lower, and the mortality difference in the research is large enough that most clinicians consider withholding medication hard to justify. If someone is committed to a medication free path, they should at minimum have naloxone, people around them, and a plan for the relapse risk window.
Opioid tolerance falls much faster than it builds. After a week or two away, a previously routine dose can be lethal. This is the mechanism behind the concentration of overdose deaths just after jail release or a completed detox.
Acute withdrawal is roughly a week. Sleep, energy, mood and cravings commonly take weeks to months to settle. That gap between expecting to feel well and not feeling well is a high risk period, and it is far easier to get through with clinical support than alone.
Yes. It is often silent for years while causing liver damage, and current treatment cures the large majority of cases with a short oral course. Testing is straightforward and widely available.
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Need help now? In an emergency call 911. If you are in crisis or thinking about suicide, call or text 988 to reach the Suicide and Crisis Lifeline (veterans press 1). For free, confidential treatment referrals 24 hours a day, call the SAMHSA National Helpline at 1-800-662-4357. You can also search licensed programs at FindTreatment.gov.
This page provides general health education. It is not medical advice, a diagnosis, or a treatment plan. Never stop or change a prescribed medication without speaking to a clinician first. Withdrawal from alcohol, benzodiazepines and barbiturates can cause seizures and can be fatal without medical supervision.