commonly referred to as yellow jackets or nembies; common brand name for phenobarbital sodium, used in hospitals as an anti-convulsant/sedative.see barbiturate

 some side-effects include(in no particular order):
  1. shortness of breath
  2. loss of motor skills
  3. nausea

 prolonged use of nembies will result in increased bouts of unconsciousness and eventual death.