Analgesic on trial.
D000698:Analgesia; D000700:Analgesics / Q000008:administration & dosage*; D000769:Anesthesia, Inhalation; D006801:Humans; D009609:Nitrous Oxide / Q000008:administration & dosage*; D010100:Oxygen / Q000008:administration & dosage*
D000700:Analgesics; D009609:Nitrous Oxide; D010100:Oxygen