NRx Pharmaceuticals, Inc. announced submission an Investigational New Drug (IND) application to the U.S. Food and Drug Administration (FDA) for the use of NRX-101 to treat Chronic Pain. The IND application leverages pioneering research on the use of D-cycloserine (a key ingredient of NRX-101) in the treatment of chronic pain and the recent licensure by NRx of a US Patent for the use of D-cycl closerine in the treatment of pain. Nonclinical and substantial clinical data are already on file with FDA for NRX-101, which has already been granted Breakthrough Therapy Designation for the treatment of suicidal Bipolar Depression.