Early-life CBD combined with sodium nitroprusside prevented schizophrenia-like behaviors in rats more effectively than either alone, with stronger protective effects in females.
Psychosis researchers, neuroscientists studying sex differences, those interested in preventive psychiatry approaches.
Combination prevented memory deficits in both sexes
What the researchers found
Rats pretreated with CBD and sodium nitroprusside (SNP) during brain development (postnatal days 12-32) and later challenged with ketamine showed sex-dependent responses. Females showed greater hyperlocomotion and long-term memory deficits; males showed reduced sucrose preference and short-term memory impairments. CBD or SNP alone had limited efficacy, but their combination reduced hyperlocomotion and prevented memory deficits in both sexes, with superior effects in females.
Why it matters
This is the first preclinical evidence of sex-dependent prophylactic effects of CBD combined with nitroprusside in a schizophrenia model. The finding that early intervention during brain development could prevent later psychosis-like symptoms opens new thinking about preventive approaches.
The numbers in context
Treatment during postnatal days 12-32. 10-day washout before ketamine challenge. Combination treatment reduced hyperlocomotion and prevented NOR deficits in both sexes. Superior prophylactic effects in females by multivariate analysis.
How the study worked
Wistar rats were pretreated with CBD and SNP (alone or combined) during postnatal days 12-32. After 10 days, schizophrenia-like deficits were induced with ketamine. Behaviors were assessed using Open Field Test (locomotion), Sucrose Preference Test (anhedonia), and Novel Object Recognition (memory). Multivariate analysis and unsupervised clustering examined sex differences.
What this study cannot tell us
Animal study in rats; results may not translate to humans. Ketamine model only approximates some features of schizophrenia. CBD and SNP doses and timing in rats cannot be directly translated to human developmental periods. Did not examine long-term outcomes or potential side effects of early-life cannabinoid exposure.
How to read the evidence
Preliminary: first-of-its-kind animal study with promising results but far from human application.
When this study was published
2025 study
The bigger picture
Schizophrenia treatments are largely reactive rather than preventive. This animal study suggests that early CBD intervention during critical brain development windows might prevent psychosis-like symptoms from emerging, though translating this concept to human prevention would require extensive further research.
Questions still open
- Could early CBD intervention in at-risk adolescents prevent psychosis onset? What mechanisms explain the superior effects in females? Would the combination approach work with other schizophrenia models?
Common questions
Could CBD prevent schizophrenia?
Why did the treatment work better in female rats?
Read the original research
Prophylactic efficacy of cannabidiol and sodium nitroprusside in a ketamine-model of schizophrenia: sex-dependent effects on positive-like and cognitive impairments.
Revista brasileira de psiquiatria (Sao Paulo, Brazil : 1999)
Citation
Prado, Daniel B A; Rossignoli, Matheus T; Ruggiero, Rafael N; Santos, José E P; Leite, João P; Dursun, Serdar M; Dursun, Leman H; Zuardi, Antonio W; Dos Santos, Rafael G; Abilio, Vanessa C; Abrão, João; Crippa, José A; Avelar, Gleiciane G; Hallak, Jaime E C; Dias, Isabella C S. (2025). Prophylactic efficacy of cannabidiol and sodium nitroprusside in a ketamine-model of schizophrenia: sex-dependent effects on positive-like and cognitive impairments.. Revista brasileira de psiquiatria (Sao Paulo, Brazil : 1999). https://doi.org/10.47626/1516-4446-2025-4301
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