It is mainly used in treatment of restless leg syndrome and fibromyalgia in
human beings. Besides, it has some other veterinary usage for rabbits, cows, dogs
etc. and also in transportation of fish.
Whether the use is on human beings or on the animals or on fish, tramadol works on the central nervous system and works as a sort of pain killer or stress reducer. In case of human beings, it works on the µ receptors and thus controls the signal of pain that the nervous system sends to the brain.