This is what I found about overdosing:
Intoxications have been reported with a maximum of 3000 mg, associated with cerebral seizures, nausea, vomiting, agitation, mania, insomnia and tremor. There are 2 deaths among 38 reports.
That sounds unsafe and, above all, very unpleasant. I once had an overdose of another medication where I was wide awake and noticed everything. That wasn't good... And as far as I know, seizures can damage the brain.
Do you want to die or is it some kind of self-harm?