Short answer
Cannabis-induced psychosis is treated by stopping all cannabis use, keeping the person supervised in a calm setting, and getting a medical evaluation the same day. Severe cases need emergency care, where clinicians may use antipsychotic medication for hallucinations or delusions and sedatives for agitation. Most symptoms ease within days to weeks once cannabis clears, but some people need longer psychiatric care.
How to Get Help for Cannabis Psychosis
What to have ready
- A sober adult who can stay with the person the whole time
- A phone for 911 or the 988 Suicide and Crisis Lifeline
- A list of what was used, how much, and when, including edibles, vapes, and concentrates
- Any prescriptions the person takes and known medical conditions
Steps to take
- Check for immediate danger. Move sharp objects, weapons, and car keys out of reach.
- Call 911 if the person threatens self-harm, threatens someone else, or cannot be kept safe.
- Call 988 if the person is frightened, hearing voices, or paranoid but not in immediate danger.
- Stay with them and keep the room quiet, lit low, and free of crowds.
- Speak in short, plain sentences and identify yourself each time you enter the room.
- Skip the argument about whether the delusion or hallucination is real.
- Write down the timeline of use, first symptom, and any change in behavior.
- Go to an emergency department for same-day assessment, even if the person seems to settle.
- Expect screening tests such as vital signs, a urine drug screen, blood work, and sometimes imaging to rule out other causes.
- Ask the clinician which drugs are being given and what each one is for.
- Book psychiatric follow-up within one week of discharge.
- Stop cannabis completely after the episode, including edibles, vapes, and concentrates.
Medications clinicians may use
There is no drug approved to reverse cannabis intoxication. Care is symptom-based. Emergency clinicians may give a short course of an antipsychotic such as haloperidol or olanzapine when hallucinations, delusions, or severe agitation are present. A benzodiazepine such as lorazepam may be used for agitation or anxiety. Fluids and a quiet room are part of the plan. Evidence for specific drug choices comes mostly from case reports and small studies, so treatment is tailored to the person.
symptoms of cannabis psychosis
How long it lasts
Cannabis-induced psychosis usually improves within one to seven days with abstinence and supportive care, though some people have symptoms that last for weeks. THC and its metabolites stay in the body for days to weeks after heavy use, and symptoms can outlast the drug itself. A history of schizophrenia in the family, high-THC products, and daily use all raise the odds of a longer course or a later diagnosis.
Cannabis-Induced Psychosis vs Schizophrenia: First Pick, Then Options
Get emergency help right away if
- The person talks about suicide or self-injury
- The person threatens violence toward others
- There is confusion, fainting, chest pain, or trouble breathing
- Symptoms keep getting worse after several hours of calm supervision
- You cannot tell what substance was taken or whether something else was mixed in
After the episode
Follow-up matters more than the emergency visit. Ask for a referral to psychiatry or addiction medicine, keep the appointment, and tell the clinician about every substance involved. Sleep, hydration, and a predictable routine help recovery. Counselors can address the reasons for use and build a plan to avoid relapse. Anyone with a personal or family history of psychosis should treat cannabis as a high-risk substance and discuss safer alternatives with a clinician.