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Hello I am Dr RB :-) Gabapentin is a strong narcotic pain medication and can have a side effect associated with varying degrees of sedation. It is commonly used for neuropathic pain such as deep pain associated with her teeth extractions. My personal feeling is that Gabapentin should be dosed at about 2-4 mg/kg 2 times daily. For a 10 lb cat, this should be about 20-25 mg every 8-12 hours. Therefore a 100 mg capsule is a bit much.
After 12 hours has passed her system should be all clear of the medication and the more hydrated is the faster it will clear. Wait until she this dose is cleared before dosing again. You should be able to assess this based on her attitude.
For or future dosing, I would open the capsule and divide it into 4 doses per capsules. Give her a dose every 8-12 hours and only as needed to keep her comfortable.. A little light sedation and sleeping is okay and to expected but what you are describing is too much sedation.. I hope this advice is helpful for you and that she feels much better soon! Let me know if you need further explanation. Also please take some time to rate my response and our conversation:)