With the aim of finding new anticonvulsant drugs, new 6-substituted-[1, 2, 4] triazolo [3, 4- a](tetrazolo [5, 1-a]) phthalazine derivatives (1–34) have been designed and synthesized. All the compounds were evaluated for their anticonvulsant activities using the maximal electroshock test (MES). Most of the synthesized compounds exhibited potent anticonvulsant activities in the MES. The most promising compound 14 showed significant anticonvulsant ...