[anonymous]

If you got the medication from a veterinary clinic, most likely it was prepared by a “compounding pharmacy” especially formulated for veterinary use and does not contain xylitol. Read the label and check with the vet to put your mind at ease.
Gabapentin is an effective medication. There are risks of side effects with any effective medication. The question is does the benefit outweigh the risk? Most often the answer is yes.

https://www.compoundingcenter.com/gabapentin-for-dogs/ (excerpt below)
You may also see gabapentin called by its brand name, Neurontin. Gabapentin is used in both human and veterinary medicine. However, you should never use your own Neurontin prescription to treat your pet. Dogs and cats require much different dosages and formulations from those that are safe for human treatment.
In particular, some of the inactive ingredients, like xylitol used in liquid formulations can be dangerous for your pet’s liver. An accredited compounding pharmacy will be able to provide doses that are appropriate for your dog or cat’s weight and level of pain. On the whole, gabapentin is quite safe for treating your pet’s pain symptoms. Most dogs and cats experience few side effects. For those who do have an adverse reaction, sedation or temporary loss of coordination are the most common. These may possibly be prevented by reducing the dosage.