The medications out there for use in pain control and PN are not
very efficient. Some nerve pain does not respond to opiates well.
And Neurontin/Lyrica have only about 30% success rate.

People expect medications to work, and therefore are quite disappointed when they don't work well at all.

You may find lifestyle changes and using specific supplements taylored to your type of PN more effective.

I find topical use of Salonpas patches, or Liderderm RX patches, and magnesium lotion, all work pretty well for me. I also use
high gauss magnets for pain at night. (there is a magnet thread here if you search "magnets".)