What is the shelf life of gabapentin?

Definitely! From what I have read (and I just researched the shelf life of gabapentin for my own edification, it lasts at the very least five years, and probably much longer than that, even! So a few months is absolutely nothing and it will not have lost any potency.

Here's a link to a helpful answer about pharmaceutical expiration dates: https://www.drugs.com/article/drug-expiration-dates.html

I hope this was helpful. :)