Pain Backlinks¶ feedback Feedback is a signal that tells you how you are doing. This signal can be negative, like pain telling you to not touch fire. Or positive, like compliments when you do something nice. analgesic Analgesics are medications that relieve pain by either reducing inflammation or changing the way the brain perceives pain. Entonox Entonox® is a gas – a mixture of half oxygen and half nitrous oxide that is used for pain relief. Fentanyl Fentanyl is a highly potent synthetic piperidine opioid primarily used as an analgesic. Its primary clinical utility is in pain management laughing gas vs benzodiazepines Laughing gas is commonly used in medical and dental procedures for its pain-relieving and sedative properties.