Metronidazole can cause nerve damage, but in this case they clearly killed the infection and resolved the nerve damage. What's interesting though is that they're so aware of this potential problem that they defensively note that it didn't do so in this case, etc. That they use such meds when they know they can cause such lifelong and at times debilitating conditions, say like PN, is beyond me!

This is also worth reading, especially if you're interested in what it can do long term: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3870550/

And there's this: http://www.nejm.org/doi/full/10.1056...99307153290318.