You should probably check with your pharmacist about this. They may effect each other; if I understood the web page right neurontin appears to decrease hydrocodone potency to some degree and the hydrocodone increases neurontin potency to some degree. Morphine also increases neurontin activity. Percocet is made up of oxycodone which is related to morphine and hydrocodone.
It sounds like taking them together could reduce the activity of one while increasing the activity of the other. Your pharmacist would know better.
See our Neurontin profile.
Good luck with the drugs.