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Other names | TAK-994 |
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Formula | C22H25F3N2O4S |
Molar mass | 470.51 g·mol−1 |
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Firazorexton (INN ; development code TAK-994) is an experimental orexin 2 (OX2) receptor agonist first described in a 2019 patent filed by Takeda Pharmaceutical Company. [1] [2]
Firazorexton was studied by Takeda for the treatment of narcolepsy. [3] [4] [5] It is a small-molecule and orally active compound and acts as a highly selective agonist of the orexin receptor 2 (OX2) with >700-fold selectivity over the orexin receptor 1 (OX1). [3] [4] [6] [7] Firazorexton is related to danavorexton (TAK-925). [8]
The compound reached phase 2 clinical trials for narcolepsy. [9] However, clinical development was discontinued in October 2021 for safety reasons. [8] [10] [11] [12] [13] More specifically, it produced severe drug-induced liver injury in phase 2 trials. [14] This hepatotoxicity is unlikely to be related to firazorexton's orexin receptor agonism. [14]
Proposed INN: List 123