NutriStack
Cannabis (THC-Dominant) and Risperidone, a conflict.
THC-dominant cannabis can interfere with risperidone's relapse-prevention role in psychosis. Continued cannabis use in people with psychotic disorders is linked with higher relapse, nonadherence, and antipsychotic treatment failure. Risk is greatest with high-potency THC, frequent use, and a history of cannabis-related psychosis.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.
From the interaction database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- Cannabis (THC-Dominant) and Risperidone
- Pair type
- Conflict
- Evidence (highest tier)
- Strong
- Source citations
- 2 sources
- Stack Score effect
- −10 to your Stack Score (per scored conflict row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Conflict · Strong evidence
Conflict
What is happening. THC-dominant cannabis can interfere with risperidone's relapse-prevention role in psychosis. Continued cannabis use in people with psychotic disorders is linked with higher relapse, nonadherence, and antipsychotic treatment failure. Risk is greatest with high-potency THC, frequent use, and a history of cannabis-related psychosis.
Mechanism. THC can acutely worsen psychotic symptoms through CB1 receptor activation and downstream changes in dopamine and glutamate signaling. Cannabis-associated nonadherence and symptom worsening oppose risperidone's D2/5-HT2A-mediated antipsychotic effect.
Recommendation. Avoid THC-dominant cannabis while taking risperidone for psychosis or mood stabilization. If you are using cannabis, tell your prescriber so they can monitor relapse risk, adherence, and side effects. Timing separation does not address the main risk.
Sources (2)
- Zammit S, Moore TH, Lingford-Hughes A, Barnes TR, Jones PB, Burke M, et al. Effects of cannabis use on outcomes of psychotic disorders: systematic review. Br J Psychiatry. 2008;193(5):357-363. PMID 18978312
- Reid S, Bhattacharyya S. Antipsychotic treatment failure in patients with psychosis and co-morbid cannabis use: A systematic review. Psychiatry Res. 2019;280:112523. PMID 31450032
Stack Score
How this pair moves the number.
Effect on the composite score
If both Cannabis (THC-Dominant) and Risperidone are in the same stack, this pair applies −10 to your Stack Score (per scored conflict row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
Check your full routine
One pair was the worked example. NutriStack runs every pair in your stack at once.
Drop in your supplements and prescriptions and the public database surfaces every interaction, synergy, timing rule, and contraindication, every one linked to its primary source.