<unk>  (pronounced eye-deb-eh-known, trade names Catena, Raxone, Sovrima, among others) is a drug that was initially developed by Takeda Pharmaceutical Company for the treatment of Alzheimer's disease and other cognitive defects. This has been met with limited success. The Swiss company Santhera Pharmaceuticals has started to investigate it for the treatment of neuromuscular diseases. In 2010, early clinical trials for the treatment of Friedreich's ataxia and Duchenne muscular dystrophy have been completed. As of  December 2013[update] the drug is not approved for these indications in North America or Europe.
Chemically,<unk>  is an organic compound of the quinone family. It is also promoted commercially as a synthetic analog of coenzyme Q10 (CoQ10).
Idebenone
Mesterolone
Levoverbenone
Metenolone
Flurandrenolide
Vardenafil
Avanafil
Metenolone enanthate