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Introduction: Some studies show magnesium has anticonvulsive effect in some animal models. Despite of the availability of well-studied anticonvulsant drugs, this evaluation was not carried on new kind of magnesium supplement, magnesium oxide nanoparticles (nMgO). According to the interaction between magnesium and convulsion, this study was designed to evaluate the effect of nMgO on strychnine-induced convulsive model in compared to its conventional in diabetic and normal mice. Methods: Healthy male albino mice were divided to 10 groups. Diabete mellitus was induced by streptozocin in 5 groups. Conventional and nanoparticle MgO (5&10mg/kg) in presence and absence diabetes injected to mice, then strychnine injected and onset of convulsions and time of death were measured after strychnine administration. Results: Convulsive parameters did not change in normal and diabetic mice. cMgO pretreatment did not have anticonvulsant effect in strychnine-induced convulsion in normal and diabetic mice. But nMgO significantly changed convulsion onset and death time after strychnine administration in normal and diabetic status. Discussion: According to our results It seems that nMgO may be important in prevention or treatment of epilepsy and has more efficacy than its conventional form to showing anticonvulsive effect that probably is related to the physicochemical properties of nMgO, specially in diabetic subjects, a point that need to further investigation.

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