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Hello. I'm sorry for the long wait. I just logged on and saw this.
I'm sure you have learned by now that this is not an issue. You may see some sedation as a side effect, but these are not going to be toxic doses. I would go back to regular Phenobarb dosing in 12 hours. I would skip the next Fluoxetine dose, and re-assume that dose in 24 hours.
I'm sorry again for the wait, I just wanted to make sure your question was addressed.