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The following adverse experiences were reported at a frequency of 1% or greater in clinical trials and were considered to be probably related to the use of butorphanol: Body as a Whole: Asthenia/lethargy, headache, sensation of heat.
Digestive: Anorexia, constipation, dry mouth, nausea and/or vomiting, stomach pain.
Nervous: Anxiety, confusion, dizziness, euphoria, floating feeling, insomnia, nervousness, paresthesia, somnolence, tremor.
Skin and Appendages: sweating, pruritus.
Special Senses: blurred vision.
The following adverse experiences were reported with a frequency of less than 1% in clinical trials and were considered to be probably related to the use of butorphanol: Cardiovascular: hypotension, syncope.
Nervous: abnormal dreams, agitation, dysphoria, hallucinations, hostility, withdrawal symptoms.
Skin and Appendages: rash/hives.
Urogenital: impaired urination
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