Succinylcholine
Succinylcholine is a depolarizing skeletal muscle relaxant consisting of two molecules of the endogenous neurotransmitter [acetylcholine] (ACh) linked by their acetyl groups. It has been widely used for over 50 years, most commonly in its chloride salt form, as a means of neuromuscular blockade during intubation and surgical procedures. Its rapid onset and offset, with effects beginning within 60 seconds of intravenous administration and lasting between four to six minutes, make succinylcholine particularly useful in the setting of short medical procedures requiring brief periods of muscle relaxation.