Circulatory depression, shock, cardiac arrest
Bradycardia, hypotension
CNS depression, sedation
Apnea, respiratory arrest/depression
Anaphylaxis, laryngospasm
Dependence
ADH release, hypogonadism
Drowsiness, dizziness, confusion, headache
Pruritis
Xerostomia, constipation, vomiting
Urinary retention
Pancytopenia
Weakness
Hypoxia
Histamine release, urticaria
Afib, tachycardia, edema, chest pain
Abdominal pain
Morphine
Codeine
Methadone
Meperidine
Butorphanol
Fentanyl
Benzocaine
Oxycodone