<unk>  (ISF 2522) is a nootropic drug of the racetam family and very mild stimulant.  Several studies suggest that the substance is safe even when high doses are consumed for a long period of time.  However, the mechanism of action of the racetam drug family is still a matter of research.<unk>  is not approved by Food and Drug Administration for any medical use in the United States.
Oxiracetam
Piracetam
Levetiracetam 
Brivaracetam
Mesuximide
Ethosuximide
Topiramate
Methsuximide