Case Series Documents Psychotic Episodes Triggered by Abrupt Cannabis Withdrawal | Research

The takeaway

Four patients developed psychotic symptoms after abruptly stopping chronic cannabis use, suggesting cannabis withdrawal itself may be a risk factor for psychosis, not just cannabis use.

Psychiatrists, addiction specialists, cannabis cessation counselors

Psychosis triggered by cannabis withdrawal, not use

What the researchers found

Four patients referred to a mental health department between 2019 and 2023 developed psychotic features specifically after abrupt cannabis cessation, representing a distinct clinical phenomenon from cannabis-induced psychosis during active use.

Why it matters

Most research on cannabis and psychosis focuses on active use. This case series highlights the underrecognized possibility that abrupt cessation can also trigger psychotic episodes.

The numbers in context

4 patients; evaluated between 2019 and 2023; psychosis emerged after abrupt cessation of chronic cannabis use.

How the study worked

Case series of 4 patients evaluated at a single mental health department between 2019 and 2023 who developed psychotic features after abrupt cannabis withdrawal.

What this study cannot tell us

Only 4 cases from a single center. Cannot rule out coincidental psychotic onset or residual THC effects. Case reports cannot establish causation.

How to read the evidence

Small case series from a single center; hypothesis-generating but cannot establish causation.

When this study was published

2024 publication with 2019-2023 cases

The bigger picture

If cannabis withdrawal can trigger psychosis, clinicians may need to consider gradual tapering rather than abrupt cessation, particularly in patients with vulnerability to psychotic disorders.

Questions still open

How common is withdrawal-associated psychosis among chronic cannabis users who quit abruptly?
Would gradual cannabis tapering reduce the risk of withdrawal psychosis?

Common questions

Can quitting cannabis cause psychosis?

This case series describes 4 patients who developed psychotic symptoms after abruptly stopping chronic cannabis use. While it cannot prove causation, withdrawal-related psychosis may be an underrecognized phenomenon.

Should people taper off cannabis rather than quit cold turkey?

These cases raise the question of whether gradual reduction might be safer than abrupt cessation for chronic heavy users, though the evidence is too limited for clinical recommendations.

Read the original research

New insight in psychotic cannabis withdrawal: case series and brief overview.

Rivista di psichiatria, 59(6), 316-321

View on PubMed ↗Publisher’s paper ↗

Citation

Ricci, Valerio; De Berardis, Domenico; Martinotti, Giovanni; Maina, Giuseppe. (2024). New insight in psychotic cannabis withdrawal: case series and brief overview.. Rivista di psichiatria, 59(6), 316-321. https://doi.org/10.1708/4386.43840