<unk> (injection) is an opioid agonist-opioid antagonist, analgesic that is FDA approved for the treatment of management of pain when the use of an opioid analgesic is appropriate.   Common adverse reactions include nausea, vomiting, dizziness, insomnia, sedation, somnolence, and nasal congestion.
Butorphanol 
Normorphine
Levorphanol
Morphine 
Hydromorphone 
Oxymorphone 
Nalorphine
Dihydrocodeine