Opioid Analgesics - include
Alfentanil, Codeine,Fentanyl, Hydrocodone,
Hydromorphone, Levorphanol, Mepridine,
Methadone, Morphine Sulfate, Opium,
Oxycodone, Oxymorphone, Propoxyphene,
Ramifentanil, Sufentanil, Tramadol