Anesthesia is the use of anesthetic drugs to put into the patient's body, either through inhalation or intravenous, leading to a reversible state of anesthesia. Patients can breathe on their own or with active controlled breathing during anesthesia.

Ketamine is classified as a Schedule III drug and is approved for use in hospitals and medical facilities as an anesthetic. However, Ketamine is also a synthetic drug and is abused for other purposes because of its hallucinogenic and sedative effects. Prolonged use can lead to tolerance and addiction.