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Priority admissions are now available - Call 1300 856 847
Priority admissions are now available
Call 1300 856 847
Priority admissions are now available - Call 1300 856 847
Priority admissions are now available
Call 1300 856 847
Heroin, known clinically as diacetylmorphine, is a semi-synthetic opioid derived from morphine and processed from the opium poppy. As with all man-made or chemically altered drugs, it is impossible to know for certain which substances have been added, which means there might be unforeseen side effects due to especially harmful additives.
It also makes it very difficult to determine the strength of any given batch, and that unpredictability is one of the reasons the risk of heroin overdose is high, even for people who have been using heroin regularly for years.
Heroin is essentially a strong sedative, meaning that it initially gives the user a feeling of deep relaxation and peace as the drug acts as a suppressant on the central nervous system.
The immediate physical experience of heroin is dominated by sedation and pain relief. Heart rate slows, muscles relax, and the person often drifts into a heavy, disconnected state that is sometimes described as “on the nod,” moving in and out of consciousness while the drug is active. Pupils become very small, speech may slow or slur, and breathing becomes shallow and reduced.
New heroin users often experience nausea and vomiting, which brings with it the risk of choking on their vomit while they are incapacitated. This risk is not limited to new users; habitual heroin users are always in danger of misjudging the potency of their dose, which may leave them vomiting while unconscious. Other side effects of heroin can include stomach and leg cramps, dry mouth, watery eyes, and low body temperature.
The most acute short-term danger is respiratory depression. Heroin suppresses the brain’s automatic drive to breathe, and in a sufficient dose, particularly when combined with other drugs such as alcohol or benzodiazepines, it can cause very slow breathing to the point of stopping entirely. Because every batch of street heroin varies in strength, and because there is no way to test potency in the moment, this risk is present across every single use.
The signs include extreme drowsiness or an inability to be woken, very small “pinned” pupils, slowed or troubled breathing, cold or pale skin, a slow heartbeat, and, in severe cases, purple or blue lips and fingertips.
An overdose is a medical emergency and requires an immediate call to triple zero (000). The medication naloxone can temporarily reverse the effects of opioid overdose and is available free of charge through the Australian Government’s Take Home Naloxone program without a prescription.
As heroin is most commonly used intravenously, many of the long-term physical health risks are tied to injecting behaviour, particularly where sterile equipment is not used consistently. Common consequences of injecting heroin without sterile technique include:
People who share needles or injecting equipment are at significantly greater risk of contracting blood-borne viruses, including hepatitis B, hepatitis C, and HIV. Hepatitis C in particular is common among people with a history of intravenous heroin use, and many people live with it for years before receiving a diagnosis. Needle and syringe programs are available across Australia to reduce this harm, but the risk is not eliminated even with single-use equipment.
Other long-term physical consequences of sustained heroin use include severe constipation, tooth decay driven by reduced saliva production, loss of appetite and associated weight loss, and increased susceptibility to respiratory illnesses, including pneumonia.
For women, irregular or absent menstrual cycles are frequently reported. Both men and women commonly experience a reduction or complete loss of libido over time.
In the immediate term, heroin produces a powerful suppression of anxiety, emotional pain, and psychological distress. For people already living with depression, anxiety, trauma, or PTSD, this temporary relief is often part of what makes heroin so addictive. The drug doesn’t resolve anything, but it creates a window of peace that the person’s own nervous system has not been able to produce independently, and that experience is remembered and sought again.
Beyond the initial euphoria, the short-term psychological picture also includes emotional blunting, reduced concentration, and a growing disconnection from ordinary life that gradually erodes engagement with the things and people that once mattered. As the drug wears off, mood tends to fall sharply, and the period between doses is often characterised by irritability, anxiety, agitation, and a preoccupation with obtaining more heroin that progressively crowds out other thoughts and motivations.
Heroin users often experience feelings of depression, anxiety and hopelessness; especially since heroin addiction has the potential to permeate every aspect of a person’s life. Maintaining a heroin addiction can lead to financial hardship, relationship breakdowns and homelessness.
Research from UNSW Sydney and the National Drug & Alcohol Research Centre reports that people who use heroin also have elevated rates of post-traumatic stress disorder, borderline personality disorder, and antisocial personality disorder. Suicidal ideation is not uncommon in this context, and suicide rates among people with heroin dependence are estimated at approximately fourteen times that of the general population.
The same research identified memory impairment as a widely recognised long-term consequence of regular heroin use, including cognitive damage resulting from oxygen deprivation during non-fatal overdoses.
The intersection of heroin dependence and mental health is also one of the strongest arguments for dual diagnosis treatment. Australian research consistently shows that 50 to 76 per cent of people presenting to drug and alcohol treatment services have at least one co-occurring mental illness, and for heroin specifically, depression, anxiety, and PTSD are among the most frequently seen.
Treating one without adequately addressing the other tends to leave the underlying drivers of use intact, which makes sustained recovery significantly harder.
For immediate advice, Australians can contact the National Alcohol and Other Drug Hotline (1800 250 015), a free and confidential service providing counselling, information and referrals to local support services.
In urgent situations, Lifeline (13 11 14) or Alcohol Drug Information Service (ADIS) (1800 177 833) are both available 24 hours a day for emotional crisis support.
Hader Clinic Queensland offers heroin addiction treatment that follows a structured three-phase approach: medically supervised detox within a licensed private hospital accredited by HDAA, followed by residential rehabilitation with programs of four, eight, or twelve weeks, and then ongoing aftercare and outpatient support to provide continuity through the transition back into everyday life.
The residential program is independently accredited by QIP and draws on evidence-based approaches across counselling, psychoeducation, physical therapy, and peer support through the therapeutic community model.
If you or someone you care about is struggling with heroin use, the health consequences do not need to reach a crisis point before professional support becomes appropriate.
The team at The Hader Clinic Queensland are here to answer your questions, give advice and help you on your journey to reclaim your life.
Learn more about heroin addiction treatment
Dr Mel Symon is the Director of Hader Group QLD, leading both Hader Clinic Queensland and Hader Clinic Queensland Private. With more than 30 years of experience in human services and over 20 years as a founder and business leader, Mel has played a central role in establishing and growing Queensland’s leading addiction treatment services.
Mel holds a PhD in Addiction Treatment from the University of Queensland, along with a Master of Mental Health, Master of Professional Management, and a Bachelor of Social Science. Since 2016, she has overseen the development of the 40-bed Hader Clinic Queensland residential rehabilitation program and, in 2021, the creation and opening of the 25-bed Hader Clinic Queensland Private Hospital.
Passionate about lifelong recovery, Mel is dedicated to evidence-based care, meaningful change, and supporting individuals to rebuild their lives through sustainable recovery pathways.
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