--especially those with central pain/thalamic pain, usually resulting from MS lesions in the spinothalamic tracts or from stroke there, who've gone up to 7200mg/day and were still getting at least a little benefit from it over lower dosages. The reason I mention that is Neurontin/Gabapentin is know to be less bioavailable, for most people, as the dosage rises--the "jump" in therapeutic effect from 1800 to 2400 mg is greater generally than that experienced in going from 3000 to 3600 mg, for example.