Ambizine was a substance, a type of drug used as a sedative medicine by Starfleet doctors in and around the Federation in the late 24th century.
In 2372, Beverly Crusher gave William T. Riker a dose of ambizine. (TNG - Slings and Arrows eBook: That Sleep of Death)
External link[]
- Ambizine article at Memory Alpha, the wiki for canon Star Trek.