Sulfonadyn-47 is a dynamin inhibitor that effectively inhibits dynamin GTPase activity with an IC50 of 3.5 µM in cell-free assays. Additionally, it disrupts clathrin-mediated endocytosis in U2OS cells (IC50 = 27.3 µM) and impedes the depolarization-stimulated uptake of the synaptic vesicle endocytosis (SVE) marker FM4-64 in isolated rat brain synaptosomes (IC50 = 12.3 µM). Significantly, in vivo administration of sulfonadyn-47 at doses of 30 and 60 mg/kg demonstrates anticonvulsant properties in the 6 Hz corneal kindling mouse model of seizures.