Opioid Analgesic Conversion Table - McMaster...Oral Opioid Analgesic Conversion Table; Opioids: Generic and Brand Names Available in Canada FENTANYL TRANSDERMAL SYSTEM 25 mcg/hr, 50 mcg/hr,...DESCRIPTION. Fentanyl transdermal system is a transdermal system providing continuous systemic delivery of fentanyl, a potent opioid analgesic, for 72 hours.