From my tens years of understanding of gabapentin, first, for most uses, it is very well tolerated. The few that don't tolerate it seem to have an allergic like reaction.

For those who take it for seizure control, they usually take a much higher dose in conjunction with another anti-seizure med. Thus, they may experience some side effects. I have taken as much as 1200 mgs at a time with no noticeable side effects. I reduced to 900 mgs as it is the minimum effective dose for me because it was very expensive back when it was sold as Neurontin. Back then, it was about $10 per 600 mgs tablet.

It is not to be taken concurrent with magnesium supplements. The magnesium will counter the gabapentin. Also, not at the same time as taking an aluminum supplement. The common sources of these are Tums and other antacids.

Leave two hours between the gabapentin and the magnesium or aluminum.