💊_233_ Drug__ Nitrous oxide      [Inhalation, called                                             laughing gas] Uses__ General anaesthetic used to               maintain anaesthesia            _ Incomplete anaesthesia (combined              with 30% oxygen) for operation in              oral cavity S.E__ CVS and respiratory depression         _ Hypoxia         _ Vitamin D deficiency in health workers           (causing osteoporosis)      MOA__ Inhibiting NMDA receptors,               enhancing GABA-A receptor activity,               and modulating opioid receptors