<unk> , also known as<unk> e, metrazol, pentetrazol (INN), pentamethylenetetrazol, Cardiazol or<unk> , was a drug used as a circulatory and respiratory stimulant. High doses cause convulsions, as discovered by the Hungarian-American neurologist and psychiatrist Ladislas J. Meduna in 1934. It has been used in convulsive therapy, but was never considered to be effective, and side-effects such as seizures were difficult to avoid.  Its approval by the FDA was revoked in 1982.
Pentylenetetrazol
Guanabenz
Guanoxabenz
Thiopropazate
Bunaftine
Muzolimine
Carbophenothion
Retigabine