NRx Pharmaceuticals Announces Submission of an Investigational New Drug (IND) Application for NRX-101 in the Treatment of Chronic Pain

NRx Pharmaceuticals

RADNOR, PA — NRx Pharmaceuticals, Inc. (Nasdaq: NRXP)  announced the recent submission of 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-cycloserine 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.

“One in five American adults suffers from chronic pain, a condition for which there are few good solutions, once NSAIDs and Tylenol-like drugs have been exhausted. There is a critical need for non-addictive, non-neurotoxic, oral medicines, particularly with the widespread recognition that opioids are not a viable option for treatment,” said Dr. Jonathan Javitt, Founder, Chairman and Chief Scientist of NRx Pharmaceuticals, Inc.  “NRX-101 targets the NMDA receptor in the brain, which has been demonstrated in extensive nonclinical and early clinical studies to mediate the pain pathway.”

Dr. Javitt continued “Based on the preliminary evidence of efficacy already demonstrated for the use of D-cycloserine in Chronic Pain, we plan to seek Fast Track Designation, Priority Review, and Breakthrough Therapy Designation for the use of NRX-101 to treat Chronic Pain.  We have already completed the critical manufacturing components required by FDA in connection with our bipolar depression program and have sufficient quantities of our investigational drug on hand to launch registrational studies in 2024, pending the results of the recently completed clinical trial funded by the US Department of Defense.”

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NRX-101 in Chronic Pain
  • Chronic pain is estimated to be a $72 billion industry today with the potential to grow to a $120 billion industry by 2033.
  • In June 2023, concurrent with announcement of the Alvogen partnership, the Company announced an expansion of its NRX-101 program to encompass treatment of chronic pain as the next focus on NRX-101’s development.
  • The company recently announced the licensure of US Patent 8,653,120 related to the treatment of chronic pain with DCS and the addition of Dr. Apkar Vania Apkarian, Professor of Physiology, Anesthesia, Surgery, and Neuroscience Institute, Northwestern University Feinberg School of Medicine, to the NRx Scientific Advisory Board. Dr. Apkarian is the inventor of the patent and a global expert in pain research and has important experience studying DCS in chronic pain.
  • D-cycloserine (DCS) has been shown to modulate the Pain Pathway at each point in the neural chain of pain: transmission at dorsal horn of the spinal cord, pain perception in the thalamus (“paleo brain”), and pain memory and processing between the paleo brain and the cortex.
  • In experimental models and clinical studies, NMDA antagonists have demonstrated attenuation of pain and shown potential to reduce opioid craving.
  • DCS has demonstrated no potential for addiction, unlike ketamine and other NMDA antagonists that bind to the “mu” opioid receptor.
  • DCS was evaluated in a pilot study at Northwestern University and showed efficacy at the higher dose levels in the study (Schnitzer, 2016). DCS is currently being examined in a confirmatory trial funded by the US Department of Defense under the Congressionally Directed Medical Research Program. The trial seeks to recruit approximately 200 participants with chronic low back pain at Northwestern University ( NCT03535688).1 Data collection is complete and statistical results are expected in the coming months.
  • Research conducted by NRx Pharmaceuticals demonstrated a 25 μg/ml dose at which D-cycloserine becomes an NMDA antagonist. The 400mg dose presented in the confirmatory trial at Northwestern University is at the lower end of the threshold and suggests that the ability to increase the D-cycloserine dose beyond 400mg, where lurasidone is used to prevent CNS side effects in NRX-101.
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