Heroin addiction is a long-term condition in which a person keeps using heroin, an opioid made from morphine, even as it harms their health, money and relationships. It is treatable: medicines such as methadone and buprenorphine, combined with therapy and support, help many people stop, and in Malaysia help is available through government clinics, AADK and private rehabilitation.
If you are looking for residential care, our page on heroin and opioid addiction treatment explains how a stay works.
What is heroin?
Heroin is a crude form of diamorphine, a drug made from morphine, which comes from the opium poppy. The European Union Drugs Agency notes that heroin from south-east Asia is usually a white powder, and that diamorphine has only limited medical use for severe pain. The Alcohol and Drug Foundation (ADF) says heroin can also be off-white granules or a light brown "rock", and that it is injected, smoked or snorted.
Heroin belongs to the group of drugs called opioids, alongside morphine, prescription painkillers and the codeine in some cough syrups. AADK counts heroin, morphine, codeine and methadone together as "opiates" in its statistics. If the problem started with a painkiller or cough mixture, our guide to codeine addiction may help too.
What does heroin do to the body?
According to the ADF, heroin can bring a rush of pleasure, pain relief and drowsiness, along with slowed breathing and tiny pupils. Effects are felt within seconds of injecting or smoking and usually last between three and seven hours.[10]
The same drug that dulls pain also slows the brain's control of breathing. That is why overdose is the biggest danger. FRANK, the UK government's drug advice service, says it is "very easy to overdose" on heroin, and warns that street heroin may be cut with stronger opioids such as fentanyls or nitazenes, so the buyer cannot know what they are taking.
Over time, NIDA (the US National Institute on Drug Abuse) says repeated use changes the physical structure of the brain, including its white matter, which may affect decision-making and how a person handles stress. The ADF lists other long-term harms: low mood, constipation, dental problems, fertility problems, damage to the heart, lungs and liver, and vein and skin infections from injecting. Sharing needles spreads HIV and hepatitis B and C. Our guide to how drugs affect the brain explains why cravings become so strong.
Signs of a heroin overdose and what to do
The World Health Organization (WHO) describes three key signs of opioid overdose:
- pinpoint pupils
- unconsciousness or being impossible to wake
- difficulty breathing
Other signs include slow, noisy or gurgling breathing, heavy snoring, and blue or grey lips and skin. If you see these, call 999 immediately, stay with the person and tell the ambulance crew everything they took.
WHO says the medicine naloxone can prevent death from an opioid overdose if it is given in time, and the ADF explains that it reverses the effects only temporarily, so the person still needs emergency care.
Mixing heroin with other drugs
Mixing raises the risk sharply. FRANK calls mixing heroin with other "downers", including alcohol, methadone and benzodiazepines, "extremely dangerous", and WHO lists combining opioids with alcohol or sedatives as a risk factor for overdose. In Malaysia that includes sleeping pills and Erimin 5, which AADK groups with benzodiazepines. The ADF adds that mixing heroin with syabu or other stimulants can hide how strong each drug is, leading to overdose when one wears off.
Signs of heroin addiction
NIDA says heroin causes profound tolerance, meaning a person needs more and more for the same effect, and that heroin use disorder is "a chronic relapsing disease that goes beyond physical dependence." Signs that use has become addiction include:
- needing heroin to work, socialise or simply get through the day
- withdrawal symptoms such as sweating, yawning, aches and a runny nose that ease after using again
- trying to cut down or stop and not managing
- money or belongings going missing, and unexplained debts
- hiding use, disappearing for days or missing work
For families, our guide to the signs of drug use covers what to look for at home.
Heroin withdrawal symptoms
When someone who is dependent stops or cuts down, the body reacts. MedlinePlus, the US National Library of Medicine's health site, describes early symptoms as agitation, anxiety, muscle aches, watery eyes, a runny nose, sweating, yawning and poor sleep. Later come stomach cramps, diarrhoea, goosebumps, dilated pupils, nausea and vomiting. NIDA adds bone pain, chills and involuntary leg movements, which is where the phrase "cold turkey" comes from. Strong cravings run through all of it.
How long does heroin withdrawal last?
Health services give a similar timeline:
- Start: MedlinePlus says symptoms usually begin within 12 hours of the last heroin. The ADF gives a range of 6 to 24 hours.
- Worst point: NIDA says major symptoms peak 24 to 48 hours after the last dose, and the ADF says days one to three are the worst.
- End: NIDA says symptoms subside after about a week. The ADF says they usually last about a week, sometimes up to ten days.
NIDA notes that some people have lingering withdrawal signs for many months. Withdrawal from methadone starts later, within about 30 hours according to MedlinePlus.
Is heroin withdrawal dangerous?
MedlinePlus describes opioid withdrawal as very uncomfortable but not usually life threatening on its own. The ADF still warns it can be potentially life-threatening and advises anyone who has used for a long time to get medical guidance before stopping. The NHS says detox in hospital or a residential setting is usually advised when a person has other physical or mental health problems, or needs to come off alcohol or benzodiazepines such as sleeping pills or Erimin 5 as well as heroin.
So please do not try to stop suddenly on your own. A doctor can use medicines to ease symptoms and keep you safe. Our guide to drug withdrawal symptoms and how to stop taking drugs explain more.
The overdose risk after a break
Tolerance falls quickly once someone stops. The ADF says tolerance can return to normal within one to two weeks without opioids, and FRANK warns that it drops after just a few days. A dose that used to feel normal can then kill.
MedlinePlus states that most opioid overdose deaths happen in people who have just detoxed. WHO lists using again after detox or release from prison as a key risk, and the NHS warns that detox lowers tolerance and raises overdose risk.
Heroin addiction treatment options
There is no single cure, but treatment works. The main options are:
- Medically supervised detox, which manages withdrawal safely. NIDA says detox is a useful first step only when followed by further treatment, and MedlinePlus says most people need long-term treatment after detox.
- Opioid substitution or maintenance treatment, where a doctor prescribes a longer-acting opioid medicine instead of street heroin.
- Talking therapies, such as cognitive behavioural therapy (CBT) and contingency management, which NIDA says work best alongside medicines.
- Residential rehabilitation, which gives time away from people and places linked to using, with therapy every day.
- Family support and aftercare at home.
Heroin addiction medication
NIDA and WHO name three main medicines:
- Methadone, a slow-acting opioid taken by mouth. It prevents withdrawal and dampens the high. See our guide to methadone in Malaysia.
- Buprenorphine, a partial opioid that reduces cravings without the same high. Suboxone combines it with naloxone to discourage injecting. Our guide to Suboxone in Malaysia has more.
- Naltrexone, which blocks opioids and can help prevent relapse. MedlinePlus warns it can cause sudden, severe withdrawal if opioids are still in the body.
WHO says maintenance treatment with methadone or buprenorphine has the strongest evidence of effectiveness for opioid dependence. These medicines must only be started and adjusted by a doctor. If you already take one, do not stop it on your own.
What about relapse?
NIDA puts relapse rates for substance use disorders at 40 to 60 percent, similar to illnesses such as asthma and high blood pressure, and says relapse does not mean treatment has failed. It means the plan needs to be resumed or changed. Because of the tolerance drop, a relapse after a break carries a high overdose risk. Our guide to relapse after rehab explains how to prepare.
Heroin in Malaysia: how big is the problem?
Synthetic drugs such as syabu now dominate. AADK's director-general told The Star in June 2026 that about 73 percent of drug cases involve synthetic drugs and just over 20 percent involve traditional drugs such as heroin and cannabis. In the first nine months of 2024, Utusan Malaysia reported, opiates were still the second most common drug type, with 38,854 people. Our guide to drug addiction statistics in Malaysia has the full figures.
Heroin is still trafficked in large amounts. In September 2026 police seized 8.83kg of heroin in George Town, Penang, Utusan reported, and in October 2026 FMT reported 20.6kg of heroin found at a temple in Klang.
Malaysia has offered methadone for years. The Ministry of Health's pharmacy guideline says methadone dispensing was introduced at government facilities in 2005, and by June 2010 it was offered at 35 hospitals and 91 health clinics, as well as at AADK centres and prisons. Ask at your nearest government health clinic or hospital about the methadone programme.
Heroin and the law in Malaysia
Heroin is controlled under the Dangerous Drugs Act 1952.
- Using heroin is an offence under Section 15(1)(a). The Star reported in October 2025 that it carries a fine of up to RM5,000 or up to two years in jail, plus two to three years of supervision.
- Possession falls under Section 12(2), with penalties that depend on the weight.
- Trafficking falls under Section 39B. FMT reported in June 2025 that it carries the death penalty or life imprisonment with whipping. Under Section 37(da), trafficking can be presumed when the amount is above a set weight, such as 15 grams of heroin.[20]
Our guide to drug laws in Malaysia explains more, and how long drugs stay in your system covers drug tests.
Asking for help is treated differently
Since the amended Act 283, adults can go to AADK directly, without a medical officer's certification or the court process, FMT reported in January 2026. Bernama reported on 18 October 2026 that about 232 people a month now seek voluntary treatment, up from 75 before the change, and the Home Minister said voluntary clients have no criminal record. Treatment can be in the community or at a PUSPEN centre, and ecentral.my describes the service as free and confidential. Our guides to voluntary drug rehab in Malaysia and what PUSPEN is explain the steps.
Common questions
How long does heroin withdrawal last?
Symptoms usually start within 6 to 24 hours, are worst in the first one to three days and ease after about a week, according to NIDA and the ADF. Cravings and poor sleep can last much longer.
Can you stop heroin at home?
It is not recommended without medical help. Withdrawal is very hard, relief is always one dose away, and the NHS says home detox with a substitute medicine can take up to 12 weeks under supervision. Speak to a doctor first.
Is methadone just swapping one drug for another?
No. WHO says methadone and buprenorphine maintenance has the strongest evidence of any treatment for opioid dependence. The NHS describes it as switching from heroin to a substitute such as methadone or buprenorphine, then staying on a stable, supervised dose.
Someone I love uses heroin. What can I do?
Learn the overdose signs and keep 999 in mind. Talk calmly when they are not high or in withdrawal, and offer one concrete next step. Our guides on how to help someone with drug addiction and when your husband is addicted can help. If you are struggling yourself, Talian HEAL 15555 is the Health Ministry's mental health helpline, and Befrienders KL answers 24 hours a day on 03-7627 2929.[24]
Getting help
If you or someone close to you wants to stop heroin, you do not have to do it alone. Methadone is available through government health clinics, and AADK's voluntary route is free. A private drug rehabilitation centre in Malaysia offers a residential stay away from everyday triggers, and our page on choosing an addiction rehab centre in Malaysia explains what to look for.
Salus is a voluntary 90-day residential programme for adults aged 18 and over in Cyberjaya, with therapy delivered alongside medical care. Our heroin and opioid treatment page explains how it works. If you would like to talk it through, contact us for a free, confidential conversation.
This article is general information, not medical advice. In an emergency, call 999.
