Otherwise I would say yes, but 4 bars is a lot, I don't know your tolerance and if the bars were pharma clean. Gabapentin potentiates a lot of drugs and particularly without tolerance can be a bit whack stuff. It increases the risk of respiratory depression associated to some drugs, but I am certain that is not real threat if the bars were pharma clean, given that you are able to write just fine. It could give you proper wobbles tho.
What was it prescribed for? Can you function without? What do you mean by saying "have to"?
So I am not saying yes but I am not saying no either.