This document discusses general anaesthetics and their classification. It describes Guedel's stages of anaesthesia and lists different inhalational and intravenous anaesthetics. Specific agents like nitrous oxide, halothane, fluranes, thiopentone, propofol and ketamine are described in detail including their properties, uses, dosages and adverse effects. Neuroleptic analgesia using fentanyl and droperidol is also summarized. Pre-anaesthetic medications given to provide comfort to patients are listed.