@cmd
I probably started taking it not to long after it became available which was 1975. Probably took it about 1980 to 1983 or 1985. Hard to remember. I believe someone asked me that question before and I wouldn’t be surprised if I gave different dates but I imagine I took it a good three years maybe five. I took a massive dose trying to get rid of seizures hoping it would help the neuropathy but it didn’t help either one.
Good luck,
Jake