The injection the dentisr uses for ruotine aneasthetics, such as when pulling a tooth or "fixing" a cavity by drilling, is the drug Lidocaine. And Lidocaine comes with or without Epinephrine. I do think that mostly the needle you get is with Epinephrine. I have often asked the dentist to use without, but he often says that there is better effect with the Epinephrine.

I did not know the interaction between Epinepgrine and Gabapentin.
That is a good thing to know!