(However, a potentially fatal adverse reaction does exist when it's injected intravenously:
laryngospasm,
a condition where the vocal cords spasm and cause suffocation. It's
sphincter-tightening for even the most seasoned physician to witness as
it requires immediate and aggressive medical intervention to prevent
cardiac arrest. Thankfully it only occurs in roughly 0.4 percent of
cases, but this fact alone should strike fear in anyone considering
using it without supervision from a medical professional.)