['diabetic peripheral neuropathic pain']
['ds-5565', 'placebo']

        Inclusion Criteria:

          -  Type 1 or type 2 diabetes mellitus at screening

          -  Painful distal symmetric polyneuropathy

          -  At screening, a pain scale of ≥ 40 mm

        Exclusion Criteria:

          -  HbA1c (National Glycohemoglobin Standardization Program) > 10.0%
      