Pentazocine Side Effects
Some side effects of pentazocine may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA.
For the Consumer
Applies to pentazocine: injection solution
Along with its needed effects, pentazocine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor or nurse immediately if any of the following side effects occur while taking pentazocine:Rare
- Black, tarry stools
- blistering, peeling, or loosening of the skin
- chest pain
- fast, pounding, or irregular heartbeat or pulse
- joint or muscle pain
- painful or difficult urination
- red, irritated eyes
- red skin lesions, often with a purple center
- shakiness in the legs, arms, hands, or feet
- shortness of breath
- sore throat
- sores, ulcers, or white spots on the lips or in the mouth
- swelling or puffiness of the face
- swollen glands
- trembling or shaking of the hands or feet
- unusual bleeding or bruising
- unusual tiredness or weakness
- Blistering, crusting, irritation, itching, or reddening of the skin
- blue-green to black skin discoloration
- bluish lips or skin
- blurred vision
- burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
- cold, clammy skin
- cracked, dry, or scaly skin
- decrease in frequency of urination
- decrease in urine volume
- difficult or troubled breathing
- difficulty in passing urine (dribbling)
- fast or slow heartbeat
- fast, weak pulse
- flushed skin
- hardening or thickening of the skin
- increased sweating
- irregular, fast, slow, or shallow breathing
- pain, redness, or sloughing of the skin at the injection site
- pale or blue lips, fingernails, or skin
- pounding in the ears
- rapid breathing
- small lumps under the skin at the injection site
- stinging at the injection site
- swelling of the lower legs or arms
- tightness in the chest
- very slow breathing
- weight gain
Some side effects of pentazocine may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:More common
- False or unusual sense of well-being
- Change in taste
- confusion about identity, place, and time
- constricted, pinpoint, or small pupils (black part of the eye)
- double vision
- seeing double seeing, hearing, or feeling things that are not there
- stomach cramps
- trouble sleeping
- unable to sleep uncontrolled eye movements
- Continuing ringing or buzzing or other unexplained noise in the ears
- difficulty having a bowel movement (stool)
- difficulty in focusing the eyes
- disturbed dreams
- dry mouth
- hearing loss
- relaxed and calm
- trouble sleeping
- unable to sleep
For Healthcare Professionals
Applies to pentazocine: injectable solution
Nervous system side effects including sweating, dizziness, lightheadedness, hallucinations, sedation, euphoria, headache, confusion, and disorientation have been reported. Weakness, flushing, disturbed dreams, insomnia, and syncope have been reported infrequently. Tremor, chills, paresthesia, irritability, and excitement have been reported rarely.
Gastrointestinal side effects including nausea and vomiting have been reported. Constipation has been reported infrequently. Abdominal distress, anorexia, and diarrhea have been reported rarely.
Depression of the white blood cell count is usually reversible.
Hematologic side effects including depression of the white blood cell count (especially granulocytes) and moderate transient eosinophilia have been reported.
Hypersensitivity reactions including rash have been reported infrequently. Urticaria and edema of the face have been reported rarely. One instance of an apparent anaphylactic reaction has been reported.
Dermatologic side effects including erythema multiforme, Stevens-Johnson syndrome, and toxic epidermal necrolysis have been reported rarely.
Cardiovascular side effects including a decrease in blood pressure and tachycardia have been reported infrequently.
Respiratory side effects including respiratory depression have rarely been reported.
Other side effects including tinnitus have been reported.
Ocular side effects including visual blurring and focusing difficulty have been reported infrequently.
Psychiatric side effects including depression have been reported infrequently.
Genitourinary side effects including urinary retention have rarely been reported.
More pentazocine resources
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