Pharmacology Other topics and Adverse effects 819d3b48 Which of the following general anaesthetics has poor muscle relaxant action? A Ether B Nitrous oxide C Halothane D Isoflurane High-Yield Explanation (Ref: KDT 6/e p371) Nitrous oxide is not a complete anaesthetic (MAC 104%). It is a good analgesic but poor muscle relaxant.