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Your artclce mentions phenytoin as a treatment that has been tried in open label studies. When I began as a neurologist I'd not heard of its use but was put on to it by a senior colleague. I do use carbamazepine as first line but have found phenytoin far superior to other second line agents. I draw the interested reader to the excellent article by Hellelink and Schatman (J Pain Res. 2017; 10: 1663-6 doi: 10.2147/JPR.S141896) which puts a case for phenytoin being considered first line.