<unk> (oral) is a analgesic opioid that is FDA approved for the treatment of anesthesia; obstetric pain, pain (moderate to severe), premedication for procedure.   Common adverse reactions include dermatologic: sweating, gastrointestinal: nausea, vomiting, neurologic: dizziness, lightheadedness, sedated.
Meperidine 
Esketamine
Fentanyl 
Ketamine
Nalorphine
Remifentanil
Codeine
Aceclidine