My neuro (Head of Johns Hopkins neuro dept) told me
DO NOT wean off Gabapentin before taking Lyrica!!
They should be titrated on a replacement schedule using the value of 1800 mgs Gabapentin/Neurontin = 300 mgs Lyrica to total the added value of Gabapentin taken on a daily basis.
One replaces the other slowly, over a period of a week to two weeks, until the Lyrica has totally replaced the Gabapentin/Neurontin.