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Priority admissions are now available - Call 1300 856 847
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Drug induced psychosis is the term applied to psychotic episodes caused by drug or alcohol abuse.
Drug-induced psychosis, also known as substance-induced psychotic disorder, is the term applied to psychotic episodes caused by drug use, intoxication, or withdrawal. These episodes can be frightening, disorienting, and deeply distressing for both the person experiencing them and the people around them.
Substances commonly associated with drug-induced psychosis include crystal methamphetamine (ice), cocaine, amphetamines, cannabis, alcohol, and hallucinogens. Both prolonged heavy use and sudden or unmonitored withdrawal can trigger psychotic symptoms.
Importantly, substance use may also worsen pre-existing mental health conditions, even when drugs or alcohol were not the original cause of symptoms.
Psychosis is more common than many people realise. According to the National Drug and Alcohol Research Centre (NDARC), approximately 1 in 300 people will experience a psychotic episode at some point in their lives. Among people with psychotic disorders, research from the Australian National Survey of Psychosis found that nearly half reported a lifetime history of alcohol dependence, and more than half reported lifetime cannabis dependence, figures that reflect how frequently substance use and psychotic illness intersect in clinical settings.
Psychosis is characterised by a loss of contact with reality, most commonly involving:
Delusions
Delusions are fixed, false beliefs that remain firmly held despite clear evidence to the contrary. Individuals may believe events occurred when they did not, feel convinced they are being watched or harmed, or misinterpret everyday interactions as threatening. These beliefs can lead to intense fear, paranoia, or panic.
Hallucinations
Hallucinations involve perceiving things that are not present. These may be:
Auditory hallucinations are particularly associated with psychotic disorders such as schizophrenia, but they can also occur during substance-related psychosis.
Without appropriate care, persistent psychotic symptoms can significantly impair functioning, relationships, and safety.
Early recognition is critical. Warning signs may include:
These symptoms may emerge suddenly or develop gradually over time. If someone is showing signs of a psychotic episode, call triple zero (000) immediately. This is a medical emergency. Do not leave the person alone, and avoid confrontation or arguing with their beliefs, as this can escalate distress.
If you are concerned about someone but the situation is not immediately dangerous, Lifeline is available 24 hours a day on 13 11 14, and the Alcohol Drug Information Service (ADIS) can be reached on 1800 177 833.
Alcohol and other drugs can significantly affect the way the brain processes thoughts, emotions, perception, and reality. Many substances interfere with neurotransmitters such as dopamine and serotonin, which play a major role in mood regulation, cognition, and sensory perception. When substance use becomes heavy, prolonged, or frequent, the risk of psychotic symptoms rises considerably.
For some people, psychosis may appear suddenly during periods of heavy use or withdrawal. Others experience a gradual decline, where paranoia, confusion, emotional instability, social withdrawal, or distorted thinking develop over time. Sleep deprivation, which is common during extended substance use, can also intensify these symptoms and contribute to a rapid deterioration in mental state.
At the same time, the relationship between psychosis and substance use is never isolated. Many people living with psychosis, trauma, anxiety, depression, or other mental health conditions turn to drugs or alcohol in an attempt to manage emotional distress, quiet intrusive thoughts, reduce fear, or temporarily escape what they are experiencing. In the short term, substances may appear to provide relief. Over time, however, they often increase symptom severity, reduce emotional stability, and make episodes of psychosis more frequent or more intense.
This can create a deeply difficult cycle where worsening mental health leads to increased substance use, while the substance use itself further aggravates psychosis. Relationships, employment, physical health, finances, and day-to-day functioning can begin to deteriorate quickly, particularly when the person is not receiving appropriate clinical support.
Ice is the substance most strongly associated with drug-induced psychosis in Australia. Research found that rates of psychosis among regular methamphetamine users are approximately 11 times that seen in the general population, and the features of methamphetamine-induced psychosis can be clinically indistinguishable from acute paranoid schizophrenia. Paranoia, persecutory delusions, and auditory and visual hallucinations are the most commonly reported features.
Read more about ice addiction and treatment
More than 1 in 10 Australians aged 14 and over have used cannabis in the past year, making it one of the most commonly used substances in the country. Cannabis has a well-documented relationship with psychosis, and the risk increases in a dose-response manner: heavy cannabis users have a fourfold risk of developing psychotic disorders compared to non-users, and a meta-analysis of 11 longitudinal population-based studies found that cannabis users overall had 2.6 times the risk of developing a psychotic disorder. Young people are particularly vulnerable, with Australian research identifying young people aged 16 to 25 as having some of the highest rates of cannabis use in the world, alongside elevated psychosis risk.
Cannabis-induced psychosis typically resolves within hours of the drug leaving the system, but in some cases, particularly where use has been heavy or prolonged, symptoms can persist for longer. Up to a quarter of people diagnosed with schizophrenia may also have a co-occurring cannabis use disorder.
Read more about cannabis addiction and treatment
Alcohol-induced psychosis is associated with chronic, heavy use and most commonly presents during intoxication or in the withdrawal period. Delirium tremens, a severe form of alcohol withdrawal that can include hallucinations, extreme agitation, and seizures, is a medical emergency requiring immediate clinical intervention.
Alcohol withdrawal should never be attempted without medical supervision for this reason. In some cases, psychotic symptoms can persist for a month or longer after alcohol use has stopped.
Read more about alcohol addiction and treatment
Cocaine and other stimulants can produce paranoia, hallucinations, and persecutory delusions during intoxication, often resolving relatively quickly once the drug clears the system. With sustained heavy use, however, these symptoms can become more frequent and more difficult to distinguish from a primary psychotic disorder.
Read more about cocaine addiction and treatment
Distinguishing between drug-induced psychosis and a primary psychotic disorder can be complex, as symptoms often look identical.
A key clinical principle is that accurate diagnosis should not be rushed.
Australian clinical guidelines emphasise the importance of ongoing monitoring during abstinence before assigning a long-term psychiatric diagnosis. Premature diagnosis can lead to unnecessary medication, stigma, and confusion for clients and families.
The clearest distinguishing factor is whether symptoms resolve with abstinence. In drug-induced psychosis, psychotic symptoms are directly linked to the presence of the substance or the withdrawal process, and they typically begin to ease as the person stabilises. In a primary psychotic disorder, symptoms persist beyond the period of intoxication and withdrawal and may continue or worsen without treatment, regardless of whether the person stops using.
There are some patterns that can indicate a higher risk of a primary disorder rather than a substance-induced one. These include a family history of schizophrenia or bipolar disorder, onset of psychotic symptoms before or independent of substance use, symptoms that persist well beyond what would be expected given the substances involved, and a history of underlying mental health conditions.
This is why the clinical assessment process at Hader Clinic Queensland involves ongoing review by the psychiatric and medical team as the person stabilises, rather than drawing conclusions during the most acute phase.
Effective treatment requires a dual-diagnosis approach, addressing both substance use and mental health symptoms together.
At Hader Clinic Queensland, we offer a Dual Diagnosis Program that focuses on:
By treating the whole person, rather than isolated symptoms, individuals are given the best opportunity for recovery, clarity, and long-term wellbeing. For people requiring stabilisation, medically supervised detox provides a safe, clinically monitored environment where withdrawal can be managed appropriately, and psychiatric symptoms can be assessed as they evolve.
From there, residential rehabilitation addresses both the addiction and the mental health picture through individual counselling, group therapy, and psychoeducation across mental health mastery, trauma, addictive behaviours, strength & resilience and relapse prevention. Ongoing support through the outpatient program and online aftercare extends that care beyond the residential phase.
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.
If you or someone you care about is concerned about drug-induced psychosis or substance use, you don’t need to wait for things to reach a crisis point before reaching out for support. A single conversation can help clarify what’s happening and what the next steps might be.
The team at Hader Clinic Queensland is here to answer your questions, provide guidance, and help you understand your options in a confidential, no-pressure environment.
Call for a confidential chat
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