In approximately 1400 patients treated with levorphanol in controlled clinical trials, the type and incidence of side effects were those expected of an opioid analgesic, and no unforeseen or unusual toxicity was reported.
Drugs of this type are expected to produce a cluster of typical opioid effects in addition to analgesia, consisting of nausea, vomiting, altered mood and mentation, pruritus, flushing, difficulties in urination, constipation, and biliary spasm. The frequency and intensity of these effects appears to be dose related. Although listed as adverse events these are expected pharmacologic actions of these drugs and should be interpreted as such by the clinician.
The following adverse events have been reported with the use of levorphanol:
Body as a Whole: abdominal pain, dry mouth, sweating
Cardiovascular System: cardiac arrest, shock, hypotension, arrhythmias including bradycardia and tachycardia, palpitations, extra-systoles
Digestive System: nausea, vomiting, dyspepsia, biliary tract spasm
Nervous System: coma, suicide attempt, convulsions, depression, dizziness, confusion, lethargy, abnormal dreams, abnormal thinking, nervousness, drug withdrawal, hypokinesia, dyskinesia, hyperkinesia, CNS stimulation, personality disorder, amnesia, insomnia
Respiratory System: apnea, cyanosis, hypoventilation
Skin & Appendages: pruritus, urticaria, rash, injection site reaction
Special Senses: abnormal vision, pupillary disorder, diplopia
Urogenital System: kidney failure, urinary retention, difficulty urinating