Substance-Induced Psychosis
Hallucinations or delusions triggered by substances
Quick Facts
- Type: Mental health condition
- Triggers: Drugs, alcohol, withdrawal, medications
- Main features: Hallucinations, delusions
- Outlook: Often resolves once the substance clears
Overview
Substance-induced psychosis is a state in which a person loses touch with reality, experiencing hallucinations (seeing or hearing things that are not there) or delusions (strongly held false beliefs), as a direct result of a substance. The trigger can be intoxication with a drug, withdrawal from a substance, or a reaction to certain medications.
Unlike psychotic disorders such as schizophrenia, the symptoms are tied to the substance and usually improve once the drug clears the body and any withdrawal resolves. However, the episode can be frightening and dangerous in the moment, and in some people substance use can unmask or contribute to a longer-lasting psychotic illness. Prompt, calm, and safe care is important.
During an episode, the person genuinely experiences the hallucinations and beliefs as real, which can be terrifying and confusing for them and for those around them. Trying to argue someone out of a delusion rarely helps and can increase agitation. Keeping the person and others safe, reducing stimulation, and getting medical help are the priorities until the substance clears and the symptoms ease.
Symptoms
Symptoms can come on suddenly and may include:
- Hallucinations, such as hearing voices or seeing things that are not present
- Delusions, including paranoia or believing one is being watched or harmed
- Confused or disorganized thinking and speech
- Agitation, fear, or aggression
- Strange or unsafe behavior
- Reduced awareness of surroundings
Agitation, paranoia, and confusion can make a person a danger to themselves or others, so the situation may need urgent help. Thoughts of self-harm are a medical emergency.
Causes
Many substances can trigger psychosis:
- Stimulants: Methamphetamine, cocaine, and high-dose amphetamines are common causes.
- Hallucinogens and cannabis: LSD, certain synthetic drugs, and high-potency cannabis can provoke psychosis.
- Alcohol and sedative withdrawal: Severe withdrawal, such as delirium tremens, can include hallucinations.
- Certain medications: Some prescription drugs, especially at high doses, can cause psychotic symptoms.
Risk is higher with large amounts, frequent use, and in people vulnerable to mental illness.
Risk Factors
- Use of stimulants, hallucinogens, or high-potency cannabis
- Heavy alcohol or sedative use and sudden withdrawal
- High doses or frequent use of substances
- A personal or family history of psychosis or other mental illness
- Combining multiple substances
People with a personal or family history of psychotic illness are especially vulnerable, and in some of them substance use can trigger a first episode that continues even after the drug clears, signaling an underlying disorder that needs ongoing care.
Diagnosis
Diagnosis focuses on linking the psychosis to a substance and ruling out other causes:
- History and timeline: Identifying recent substance use or withdrawal and how it relates to the symptoms.
- Physical and mental health exam: Assessing the person's safety, vital signs, and mental state.
- Drug testing and blood work: To identify substances and check for medical causes.
- Ruling out other conditions: Distinguishing it from schizophrenia or a medical illness that can mimic psychosis.
Treatment
Treatment keeps the person safe and supports recovery as the substance clears:
- A safe, calm environment: Reducing stimulation and ensuring safety for the person and others.
- Medications: Short-term use of medicines to calm agitation or treat severe symptoms, and specific treatment for dangerous withdrawal.
- Medical monitoring: Watching vital signs and managing complications during intoxication or withdrawal.
- Addressing the underlying use: Substance use treatment and, if symptoms persist, evaluation for an ongoing psychotic disorder.
Symptoms often resolve within hours to days once the substance is gone, though some cases last longer or signal an underlying condition.
Prevention
- Avoid stimulants, hallucinogens, and high-potency cannabis, especially if you have a history of psychosis
- Do not use multiple substances together
- Seek medical supervision when stopping heavy alcohol or sedative use
- Get help early for substance use
- Take prescription medicines only as directed
When to See a Doctor
Seek emergency care right away if someone has hallucinations, severe paranoia, confusion, or agitation, especially with recent substance use or withdrawal, or if they may harm themselves or others. Call your local emergency number or a crisis line for any thoughts of self-harm. Severe alcohol or sedative withdrawal with hallucinations is a medical emergency that needs immediate treatment.
Frequently Asked Questions
What is substance-induced psychosis?
It is a temporary break from reality, with hallucinations or delusions, caused directly by intoxication with or withdrawal from a substance such as a stimulant, hallucinogen, alcohol, or certain medications. Symptoms usually ease once the substance clears.
How is it different from schizophrenia?
In substance-induced psychosis the symptoms are tied to a substance and usually resolve once it leaves the body, whereas schizophrenia is a primary, longer-lasting psychotic disorder. Sometimes substance use can unmask an underlying psychotic illness, so follow-up is important.
Which drugs most often cause psychosis?
Stimulants like methamphetamine and cocaine, hallucinogens, and high-potency cannabis are common triggers. Severe alcohol or sedative withdrawal can also cause hallucinations, as can some prescription medications at high doses.
How long does substance-induced psychosis last?
It often resolves within hours to a few days as the substance clears and any withdrawal settles. If symptoms persist longer, it may signal an underlying psychotic disorder that needs further evaluation.
When is it an emergency?
Hallucinations, severe paranoia, confusion, or agitation, especially with any risk of harm to self or others, are emergencies. Severe alcohol or sedative withdrawal with hallucinations also needs immediate medical care.
References
- National Institute on Drug Abuse (NIDA). Drugs and the Brain.
- Substance Abuse and Mental Health Services Administration (SAMHSA).
- MedlinePlus, U.S. National Library of Medicine. Psychosis.
- National Institute of Mental Health (NIMH). Understanding Psychosis.