NALBUN 2 ML is an injectable solution containing nalbuphine hydrochloride, a synthetic opioid analgesic used to relieve moderate to severe pain. It can be administered intravenously, intramuscularly, or subcutaneously. Nalbuphine is also used as a supplement to balanced anesthesia, for preoperative and postoperative pain relief, and for pain management during labor and delivery. It works by binding to opioid receptors in the central nervous system, providing pain relief with a duration of action typically ranging from 3 to 6 hours.