I don't want to be an alarmist and keep in mind I know very little about the med . There was an article in our local paper about it, it said the potential for overdose was high because the pain killing effect didn't last too long
(7-8 hours ?) but the actual half life of the stuff (how long it stays in your system) was longer, I think 2 0r 3 days but am not sure. I hope you are careful and talk to your doctor about dosing and do not get creative. It did say it was effective for nerve pain. I really am not familiar with it so ask your Dr.
Zygo