Levorphanol Side Effects

It is possible that some side effects of levorphanol may not have been reported. These can be reported to the FDA here. Always consult a healthcare professional for medical advice.

For the Consumer

Applies to levorphanol: oral tablet

As well as its needed effects, levorphanol may cause unwanted side effects that require medical attention.

If any of the following side effects occur while taking levorphanol, check with your doctor immediately:

Incidence not known
  • Agitation
  • attempts at killing oneself
  • bluish lips or skin
  • blurred vision
  • change in consciousness
  • cold, clammy skin
  • confusion
  • decrease in the frequency of urination
  • decrease in urine volume
  • decreased urine output
  • depression
  • difficulty in passing urine (dribbling)
  • dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
  • extra heartbeats
  • extremely shallow or slow breathing
  • fast, slow, irregular, pounding, or racing heartbeat or pulse
  • fast, weak pulse
  • hostility
  • lethargy
  • lightheadedness
  • loss of consciousness
  • muscle twitching
  • no blood pressure or pulse
  • not breathing
  • painful urination
  • rapid weight gain
  • seizures
  • stopping of the heart
  • stupor
  • sweating
  • swelling of the face, ankles, or hands
  • unconsciousness
  • unusual tiredness or weakness
  • wheezing

Get emergency help immediately if any of the following symptoms of overdose occur while taking levorphanol:

Symptoms of overdose
  • Chest pain or discomfort
  • constricted, pinpoint, or small pupils (black part of the eye)
  • decreased awareness or responsiveness
  • difficult or troubled breathing
  • difficulty with sleeping
  • dilated neck veins
  • disorientation
  • drowsiness to profound coma
  • extreme fatigue
  • hallucination
  • headache
  • irregular, fast or slow, or shallow breathing
  • no muscle tone or movement
  • not breathing
  • pale or blue lips, fingernails, or skin
  • shortness of breath
  • sleepiness or unusual drowsiness
  • swelling of the face, fingers, feet, or lower legs
  • weight gain

Some levorphanol side effects may not need any medical attention. As your body gets used to the medicine these side effects may disappear. Your health care professional may be able to help you prevent or reduce these side effects, but do check with them if any of the following side effects continue, or if you are concerned about them:

Incidence not known
  • Abnormal dreams
  • absence of or decrease in body movement
  • acid or sour stomach
  • belching
  • change in personality
  • changes in vision
  • delusions
  • dementia
  • discouragement
  • double vision
  • dry mouth
  • feeling sad or empty
  • heartburn
  • hives or welts
  • increase in body movements
  • indigestion
  • irritability
  • itching
  • lack of appetite
  • loss of interest or pleasure
  • loss of memory
  • nausea
  • nervousness
  • problems with memory
  • redness of the skin
  • seeing double
  • skin rash
  • stomach discomfort, upset, or pain
  • sweating
  • tiredness
  • trouble concentrating
  • trouble sleeping
  • twitching, twisting, uncontrolled repetitive movements of the tongue, lips, face, arms, or legs
  • upper abdominal or stomach pain
  • vomiting

For Healthcare Professionals

Applies to levorphanol: compounding powder, injectable solution, oral tablet


The adverse effects of levorphanol are generally similar to the adverse effects observed with other narcotic analgesics.

Nervous system

Opioids may result in psychotic symptoms in some patients.

Nervous system side effects include mental and respiratory depression, stupor, delirium, somnolence, and dysphoria.


Other side effects including withdrawal symptoms after either abrupt cessation or fast tapering of narcotic analgesics may occur and include agitation, restlessness, anxiety, insomnia, tremor, abdominal cramps, blurred vision, vomiting and sweating.


Cardiovascular adverse effects include hypotension and arrhythmias rarely.


Gastrointestinal side effects including nausea, vomiting, and constipation are relatively common effects of narcotic analgesics.


Genitourinary side effects including urinary retention has been reported for other narcotic analgesics.


Dermatologic side effects including rashes have been reported rarely. Narcotic induced rashes may be related to direct stimulation of histamine release.

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