Apparently valproate is good for some anxiety issues as well as being an anti-convulsant. Personally I've taken it since 2009 for mood issues. It's put a cap on my hypomanias and I haven't had a full-blown hypomanic episode since I started it, but it does nothing for my depression. Yet I also know some people who have found valproate to have anti-depressant qualities.
In terms of helping with ASD issues though, I wouldn't think that valproate would help with anything except maybe for emotional regulation. It's not a drug that's specifically for ASD, anyways. I would think that if you weren't bipolar, then you could see how you go without it.
Speaking of which, thanks for reminding me that it's time to take my nightly meds.
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Said the apple to the orange,
"Oh, I wanted you to come
Close to me and
Kiss me to the core."
Think you're ASD? Get thee to a professional!