1. A synthetic opioid antagonist drug used medically to reverse the effects of opioid overdose or to counteract opioid-induced respiratory depression.
Usage: pharmaceutical/medical term; largely replaced by naloxone in modern clinical practice

Examples

• Nalorphine was administered to reverse the patient's opioid overdose.
• The emergency team used nalorphine to restore normal breathing in the unconscious patient.
• Nalorphine acts by blocking opioid receptors in the brain and spinal cord.
• Before naloxone became standard, nalorphine was a common antidote for morphine poisoning.