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Unregulated artisanal cannabis\u2010based products used to treat children with intractable epilepsies often contain relatively low doses of CBD but are enriched in other phytocannabinoids. This raises the possibility that other cannabis constituents might have anticonvulsant properties.<\/jats:p><\/jats:sec>Experimental Approach<\/jats:title>We used the Scn1a<\/jats:italic>+\/\u2212<\/jats:sup> mouse model of Dravet syndrome to investigate the cannabis plant for phytocannabinoids with anticonvulsant effects against hyperthermia\u2010induced seizures. The most promising, cannabigerolic acid (CBGA), was further examined against spontaneous seizures and survival in Scn1a<\/jats:italic>+\/\u2212<\/jats:sup> mice and in electroshock seizure models. Pharmacological effects of CBGA were surveyed across multiple drug targets.<\/jats:p><\/jats:sec>Key Results<\/jats:title>The initial screen identified three phytocannabinoids with novel anticonvulsant properties: CBGA, cannabidivarinic acid (CBDVA) and cannabigerovarinic acid (CBGVA). CBGA was most potent and potentiated the anticonvulsant effects of clobazam against hyperthermia\u2010induced and spontaneous seizures, and was anticonvulsant in the MES threshold test. However, CBGA was proconvulsant in the 6\u2010Hz threshold test and a high dose increased spontaneous seizure frequency in Scn1a<\/jats:italic>+\/\u2212<\/jats:sup> mice. CBGA was found to interact with numerous epilepsy\u2010relevant targets including GPR55, TRPV1 channels and GABAA<\/jats:sub> receptors.<\/jats:p><\/jats:sec>Conclusion and Implications<\/jats:title>These results suggest that CBGA, CBDVA and CBGVA may contribute to the effects of cannabis\u2010based products in childhood epilepsy. Although these phytocannabinoids have anticonvulsant potential and could be lead compounds for drug development programmes, several liabilities would need to be overcome before CBD is superseded by another in this class.<\/jats:p><\/jats:sec>","DOI":"10.1111\/bph.15661","type":"journal-article","created":{"date-parts":[[2021,8,12]],"date-time":"2021-08-12T22:09:25Z","timestamp":1628806165000},"page":"4826-4841","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":66,"title":["Cannabigerolic acid, a major biosynthetic precursor molecule in cannabis, exhibits divergent effects on seizures in mouse models of epilepsy"],"prefix":"10.1111","volume":"178","author":[{"given":"Lyndsey L.","family":"Anderson","sequence":"first","affiliation":[{"name":"Lambert Initiative for Cannabinoid Therapeutics The University of Sydney Sydney New South Wales Australia"},{"name":"Discipline of Pharmacology, Faculty of Medicine and Health The University 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