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Nafamostat mesylate (INN), a synthetic serine protease inhibitor, is a short-acting anticoagulant, and it is also used for the treatment of pancreatitis. It also has some potential antiviral and anti-cancer properties. Nafamostat is a fast-acting proteolytic inhibitor and used during hemodialysis to prevent the proteolysis of fibrinogen into fibrin. (2026). 9783318062977 ISBN 9783318062977 The mechanism of action of nafamostat is as a slow tight-binding substrate, trapping the target protein in the acyl-enzyme intermediate form, resulting in apparent observed inhibition.
It inhibits a large number of Lys/Arg specific serine proteinases, and is also a tryptase inhibitor, which is implicated in leaking blood vessels which is symptomatic of dengue hemorrhagic fever and of end-stage dengue shock syndrome. It is available in a generic form already used for the treatment of certain bleeding complications in some countries, there are risks of severe complications such as: agranulocytosis, hyperkalemia, and anaphylaxis which must be weighed in non-emergency care. In some countries, it used as a treatment for pancreatitis and pancreatic cancer.
This drug has been identified as a potential therapy for COVID-19, with clinical trials in Japan possibly set to begin in March 2020. With evidence that nafamostat is a potent anti-viral inhibitor in lung cells, a second round of clinical trials in Korea has begun with 10 hospitals participating. Multiple Phase 2/3 and Phase 3 clinical trials for COVID-19 in different countries are ongoing.
It has also been reported to target tubulin, favorizing its polymerization.
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