I've not had neuropathy, but I have had neurologic symptoms while on a different biologic. My rheumatologist sent me to a neurologist to make sure it was not a side effect of my medication. In some very rare cases, biologic therapy has been linked to an MS-like demyelinating syndrome. After a brain scan, some nerve conduction tests, and bloodwork, the neurologist concluded that my symptoms were attributable to Vitamin B12 deficiency, which is also common in people with SpA. So be careful not to jump to the conclusion that it's a medication side effect. Make them check your B12 and other electrolytes.