Abstract
Many patients with psychiatric illnesses are prescribed long-term drug treatment, and the anaesthesiologist must be aware of potential interactions with anaesthetic agents. Psychotropic drugs often given in combination with each other or with other non-psychiatric drugs generally exert profound effects on the central and peripheral neurotransmitter and ionic mechanisms. Hence, prior intake of these drugs is an important consideration in the management of the patient about to undergo anaesthesia and surgery. This article highlights the effects of anaesthetics on patients taking antipsychotics, tricyclic antidepressants, monoamine oxidase inhibitors and lithium carbonate. The risk that should be considered in the perioperative period are the extent of surgery, the patient's physical state, anaesthesia, the direct and indirect effects of psychotropics, risk of withdrawal symptoms and risk of psychiatric recurrence and relapse.