Aka succinylcholine, a fast-acting muscle relaxer used in emergency rooms. Kicks in in ~1 minute, burns off within ~5 minutes. Great way to disable someone in order to kill them in an inventive way.
The question? I've been able to find out most everything about this drug except mode of administration. Is it intravenous, intramuscular or subcutaneous? Or all of the above? I've found clinical tests using it intravenously, but also read of a murder case in which a massive overdose was delivered as a shot in the butt. (Ouch!) Everyone's newest favorite dead Hamas terrorist, Mahmoud Mabhouh, was supposedly put down by the Mossad via a shot of ScolineTM in the thigh and/or behind the ear, implying intramuscular and/or subcutaneous administration.
Help! Is there a homicidal doctor (or Mossad agent) in the house?