Sifrol (Pramipexole) is a dopamine agonist - that means it prompts the body to promote more dopamine. Here is what Mayo Clinic says:
https://www.mayoclinic.org/drugs-supplements/pramipexole-oral-route/side-effects/drg-20065603
It is usually used for Parkinson Disease or Restless Leg Syndrome. There have been a few studies about using it for certain type of neuropathy, but these are at the laboratory level on of animals at present. There may be some doctors trying it as an off-label use.
https://www.sciencedirect.com/science/article/pii/S0304394023003786#s0035

I certainly hope ongoing research finds a cause, and either a cure or an effective treatment!
Sue