"the biologic infliximimab"

Infliximab is a humanised monoclonal antibody which blocks the action of TNF, which is a pro-inflammatory cytokine. It has been used in treatment of a number of conditions (both autoimmune and otherwise) with an inflammatory component.

I would be cautious about it (or other biologics which block the action of TNF) in the context of peripheral neuropathy because "Peripheral neuropathy was the most common neurological [adverse effect with these biologics...]".

Source; Neurological events with tumour necrosis factor alpha inhibitors reported to the Food and Drug Administration Adverse Event Reporting System. - PubMed - NCBI.