I do not trust gabapentin. The only thing that stands out is "how" you take it. It is a drug that I thought has to be ramped up and ramped down so taking a larger dose in the evening is not good. It is a drug that is increased slowly, not a big amount in the evening to help with a sx.
But I am not sure. I eased out of gaba quite a while ago.
I can ask my pharmacist friend about it if you like. Calling your local pharmacist is always good. he/she gives drug reactions/dosage information for free. In fact, I bet pharmacists are glad to be asked!