Radequinil ( INN; AC-3933) is a cognitive enhancer which acts as a partial

inverse agonist In pharmacology, an inverse agonist is a drug that binds to the same receptor as an agonist but induces a pharmacological response opposite to that of the agonist. A neutral antagonist has no activity in the absence of an agonist or inverse agon ...

of the

benzodiazepine site The GABAA receptor (GABAAR) is an ionotropic receptor and ligand-gated ion channel. Its endogenous ligand is γ-aminobutyric acid (GABA), the major inhibitory neurotransmitter in the central nervous system. Upon opening, the GABAA receptor on ...

of the GABA_A receptor. It was under development by

Dainippon Sumitomo Pharma is a pharmaceutical company based in Japan. Its headquarters are in Chuo-ku, Osaka. The original Dainippon Pharmaceuticals (Dainippon Seiyaku) was established in 1885 by Nagayo Sensai, a graduate of Tekijuku – the first private medical school ...

for the treatment of

Alzheimer's disease Alzheimer's disease (AD) is a neurodegeneration, neurodegenerative disease that usually starts slowly and progressively worsens. It is the cause of 60–70% of cases of dementia. The most common early symptom is difficulty in short-term me ...

and made it to

phase II Phase II, Phase 2 or Phase Two may refer to: Media * Marvel Cinematic Universe: Phase Two, six American superhero films from 2013–2015 * ''Star Trek: Phase II'', an unrealized television series based on the characters of Gene Roddenberry's ''S ...

clinical trials but development seems to have been halted and it was never marketed.

References

Nootropics Oxadiazoles Lactams GABAA receptor negative allosteric modulators Phenol ethers Naphthyridines {{nervous-system-drug-stub

See also

References