Hypotension, prolonged QT, MI
Respiratory depression
SBO
Hepatotoxicity
Stroke
Sedation, coma
Drug dependence or withdrawal
Pruritus
Constipation, nausea, diarrhea, xerostomia
Dizziness, headache, somnolence
URI symptoms
Buprenorphine
Methadone
Naltrexone
Morphine
Tramadol
Dexmedetomidine
Codeine
Midazolam