‘Anaesthic drugs and fluids’ looks at anaesthetic gases, such as nitrous oxide, which are used as an anaesthetic agent, intravenous induction agents, muscle-relaxant drugs, analgesics, and intravenous fluids. Ether and chloroform have long been superseded as methods of anaesthetic. Such volatile agents are liquids that evaporate into a substance that produces general anaesthesia when inhaled. They are distinguished from each other by their properties of potency, speed of onset, and smell. What effects do anaesthetic drugs have at the molecular level? On which parts of the central nervous system do anaesthetic drugs act?