Synonym for trimethadione ... <chemical> An anticonvulsant effective in absence seizures, but generally reserved for refractory cases because of its toxicity. ... Pharmacological action: anticonvulsants. ... Chemical name: 2,4-Oxazolidinedione, 3,5,5-trimethyl- ... (12 Dec 1998) ... Found on http://www.encyclo.co.uk/local/20973