If gabapentin made my hair thin , is pregablin going to do the same?

It is possible: Neither show hair thinning as common reactions however anything is possible. I would try it and see what happens! Remember, hair thinning might have other causes as well, talk to your doctor about this.

Hair loss is not: commonly seen with this medication. I would see dermatologist for work up of hair loss, stress is a common cause of hair loss.

Hair loss: Lyrica (Pregabalin) has less than one percent chance of hair loss. I have seen a patient of mine whose hair did turn kinky and wavy with pregabalin, but she did not have any significant hair loss. So the answer is yes but it is rare.