What are the drugs used in legal execution by injection?

Answer:
  1. Sodium thiopental: ultra-short action barbiturate, an anaesthetic agent capable of rendering the prisoner unconscious in a few seconds.
  2. Pancuronium: non-depolarizing muscle relaxant, causes complete, fast and sustained paralysis of the skeletal striated muscles, including the diaphragm and the rest of the respiratory muscles; this would eventually cause death by asphyxiation.
  3. Potassium chloride: stops the heart, and thus causes death by cardiac arrest.

Other drugs may apply in different countries or states.
Contributor: Morten
First answer by Morten Brendefur. Last edit by Morten Brendefur. Contributor trust: 81 [recommend contributor recommended]. Question popularity: 2 [recommend question].