NP-120 Ifenprodil Repurposing


Research Institution

Algernon Pharmaceuticals


Algernon is a drug re-purposing company that investigates safe, already approved drugs for new disease applications, moving them efficiently and safely into new human trials, developing new formulations and seeking new regulatory approvals in global markets. Algernon specifically investigates compounds that have never been approved in the U.S. or Europe to avoid off label prescription writing.

One of the drugs Algernon has been investigating is a generic Sanofi neurological drug developed in the 1970’s called Ifenprodil, which is currently approved for use in South Korea and Japan.

Algernon investigated Ifenprodil for IPF, which outperformed the world’s leading two IPF treatments Nintedanib and Pirfenidone, in a pre-clinical in vivo animal study, reducing fibrosis by 56% with statistical significance.

Ifenprodil also outperformed Merck's phase 3 drug Gefapixant in a recent acute cough animal study by 110%.

The Company intends to submit for ethics approval for a phase 2 clinical trial for Ifenprodil for IPF and chronic cough in Australia shortly.

An independent study found that Ifenprodil significantly reduced ALI and improved survivability in an animal study with Avian H5N1 infected mice by 40% (as a result Algernon has decided to expand its Ifenprodil clinical program to include ALI and COVID-19 – read more below). Avian H5N1 is the most lethal form of influenza known to man with an over 50% mortality rate.

Ifenprodil was also shown in a separate independently published in vivo study to prolong survival under anoxic (low oxygen) conditions, as might occur in patients with severely impaired lung function.

Research Team


Project Details

Funding Sources

Cascade chemistry

Project Phases

Planned Time to Trials

Trials Active

Additional Resources

NP-120 (Ifenprodil) is an N-methyl-D-aspartate (NDMA) receptor glutamate receptor antagonist specifically targeting the NMDA-type subunit 2B (Glu2NB). Ifenprodil also exhibits agonist activity for the Sigma-1 receptor, a chaperone protein up-regulated during endoplasmic reticulum stress. Although the anti-fibrotic activity of Ifenprodil in IPF is not known, recent studies have suggested a link between both receptors and pathways associated with fibrosis.

Glutamate (Glu) is the main excitatory neurotransmitter which acts on glutamate receptors in the central nervous system (CNS) but overactivation of these receptors can cause several damages to neural cells including death. Recent studies show that the glutamate agonist N-methyl-d-aspartate (NMDA) can trigger acute lung injury (ALI). ALI is a direct and indirect injury to alveolar epithelial cells and capillary endothelial cell, causing diffuse pulmonary interstitial and alveolar edema and acute hypoxic respiration failure. ALI is characterized by reduced lung volume and compliance, and imbalance of the ventilation/perfusion ratio, inducing hypoxemia and respiratory distress and its severe stage (oxygen index <200) known as acute respiratory distress syndrome (ARDS). (1) Furthermore, pathological findings show that 64% of ARDS patients may have pulmonary fibrosis during convalescence (2).

NP-120 (Ifenprodil) was initially developed by Sanofi in the 1970’s in the French and Japanese markets for the treatment of circulatory disorders. The drug is genericized and sold in Japan and South Korea only and is used to treat certain neurological conditions.


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