Hello @speercntry, Welcome to Connect. I'm guessing your question about the amount of gabapentin you can take a day is because of the pain you are having with Trigeminal Neuralgia. As patients ourselves we are only able to share experiences and what helps us. Drugs.com does have a maximum dosage guide that may give you an idea but I would recommend discussing it with your doctor.

Gabapentin Dosage Guide + Max Dose, Adjustments: https://www.drugs.com/dosage/gabapentin.html

Have you talked with your doctor about how much gabapentin you can take?