Entonox for post-operative analgesia.
D000698:Analgesia; D001853:Bone Marrow / Q000187:drug effects; D006801:Humans; D008397:Masks; D008722:Methods; D009609:Nitrous Oxide / Q000008:administration & dosage* / Q000009:adverse effects; D010100:Oxygen / Q000008:administration & dosage; D011182:Postoperative Care; D012121:Respiration, Artificial; D013997:Time Factors
D009609:Nitrous Oxide; D010100:Oxygen