General anesthesia is a procedure performed every day worldwide due to numerous surgical and nonsurgical indications. It produces pronounced changes in the patient’s body homeostasis, primarily due to the drugs used to achieve the state of general anesthesia. The most frequent components of general anesthesia are various sedative, analgesic and hypnotic drugs, all of which exert their effects through acting on receptors in the central nervous system. The effects produced by these drugs are essential to the basic characteristics of the state of general anesthesia. However, it is evident that some of the effects of general anesthesia surpass the time actually spent in the state of general anesthesia. The effects of general anesthesia on the q...