900 mg was the right dosage at first. 4000 mg was the overdose that made me hypomanic (I did that for a week, figuring that it probably wasn't really having an effect anyway - that was right after going off the deep end so I still wasn't so much in control as I thought I was). Eventually I could go down to 300 mg, but I use a tea that has about 850 mg in a cup, so sometimes it was a bit more, and that didn't seem to matter. It's summer here now and I went to a cup of tea every other day and stopped. I've been off of it for about a month now. I'm sure I'll need it again when winter comes around, probably at 900 mg from September or October through February or March.
Good luck - I hope it works for you again if you decide to try that.

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“We should always pray for help, but we should always listen for inspiration and impression to proceed in ways different from those we may have thought of.”
– John H. Groberg