Anaesthetics are a drug that produces a complete or partial loss of feeling.
Anaesthetics are a drug that produces a complete or partial loss of feeling, so that when somebody is undertaking a medical procedure they can usually feel at ease that they are not feeling any pain, it can also mean that people wake up thinking a procedure only took a few minuted whereas it actually took hours. These can be either injected directly into the vein or inhaled through a mask.
The duration of action of IV induction agents is generally 5 to 10 minutes, after which time spontaneous recovery of consciousness will occur. In order to prolong anaesthesia for the required duration (usually the duration of surgery), anaesthesia must be maintained. Usually this is achieved by allowing the patient to breathe a carefully controlled mixture of oxygen nitrous oxide, and a volatile anaesthetic agent or by having a carefully controlled infusion of medication.