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If you want to take him off, you do want to reduce the phenobarb slowly. I would give 1/2 pill once a day for a couple of weeks. If there are no seizures, then give 1/4th a day for a couple of weeks. Then you could give 1/4th every other day for a few times and if he still seems OK, stop it.
Let me know if this is helpful and how he is doing.
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