Name: S47445
Synonyms: CX1632
Therapy Type: Small Molecule (timeline)
Target Type: Other Neurotransmitters (timeline)
Condition(s): Alzheimer's Disease
U.S. FDA Status: Alzheimer's Disease (Phase 2)
Company: Cortex Pharmaceuticals, Inc., Servier


S47445 is an agonist of AMPA receptors for glutamate, the major excitatory neurotransmitter in the brain. S47445 is being developed for the treatment of Alzheimer’s disease and depression. Originally discovered by Cortex, now called RespireRx Pharmaceuticals, and then licensed to Servier, S47445 arose from the same Ampakine® technology that previously generated CX516, now discontinued.

AMPA receptor modulators, aka ampakines, have been studied for some years as potential therapeutics for the cognitive component of various neurological disorders (for review, see Lee et al., 2016). Preclinical characterization of this compound has not been published. 


Phase 1 trials of this compound are not listed in public trials registries.

In February 2015, a Phase 2 study began enrolling 500 people who have a clinical diagnosis of both depression and probable Alzheimer's disease of mild to moderate severity. Biomarker ascertainment of the diagnosis was not required. The trial compares a six-month course of either 5, 15, or 50 mg of S47445 or placebo, taken once daily, against change on the ADAS-cog as a primary outcome. Secondary outcomes include a range of clinical measures of cognition, global function, vital signs, and depression; no biomarkers. The study is being conducted at 78 location in 12 countries in Central and South America, Central and Eastern Europe, Japan, and South Africa, and is set to run through 2017. 

For all trials of this compound, see


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Therapeutics Citations

  1. CX516

Paper Citations

  1. . AMPA Receptors as Therapeutic Targets for Neurological Disorders. Adv Protein Chem Struct Biol. 2016;103:203-61. Epub 2015 Nov 19 PubMed.

External Citations


Further Reading

No Available Further Reading