Your tapering plan sounds very wise. Because you're taking it slow and decreasing only one med at a time I think coming off meds could go really well for you.
The only experience I have with titrating down on Lamictal is going from 400mg down to 200mg. I did that decrease pretty quickly - in maybe less than a week. Suprisingly, I didn't have any bad effects. But at 400 I was feeling quite overmedicated, so dropping down to 200 was probably what needed to happen.
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