Large oblong white pill with a 12 on it and a line between numbers to break the pill in half?

Hi donna1814, Pill imprint 1 2 has been identified as Gabapentin 600 mg. It is a generic version of Neurontin.
https://www.drugs.com/imprints/1-2-21312.html

Description: Gabapentin Tablets, USP 600 mg - White colored film coated, Modified Capsule shaped, biconvex tablets de-bossed with '1' on the left side of the bisect and '2' on the right side of the bisect on one side and bisect on other.