Thank you for your comments. I'm still not sure how a Doctor determines that the drug (Levofloxacin), was the cause of the report from the patient. Is the 'known fact' that this drug causes the issues reported, enough? Will the cause be obvious from the MRI results? ( I've had Neuropathy since shortly after a spinal fusion, about twenty years ago). Is there any medical test, blood, x-ray, CAT scan, etc., to ensure a proper diagnosis that this drug caused the issue, if case other drugs are prescribed for pain management until the effects of the Levofloxacin wear off? Did the PA, and Doctor who prescribed this medication just err in judgment, or believe the benefits of the medication outweigh the risk to the patient?