Pentazocine (Injection Route)

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Side Effects

Along with its needed effects, a medicine 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:

• Black, tarry stools
• Blistering, peeling, or loosening of the skin
• Chest pain
• Chills
• Cough
• Diarrhea
• Fast, pounding, or irregular heartbeat or pulse
• Fever
• Itching
• 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
• Confusion
• Cough
• Cracked, dry, or scaly skin
• Decrease in frequency of urination
• Decrease in urine volume
• Depression
• Difficult or troubled breathing
• Difficulty in passing urine (dribbling)
• Dizziness
• Fainting
• Fast or slow heartbeat
• Fast, weak pulse
• Flushed skin
• Hardening or thickening of the skin
• Headache
• Increased sweating
• Irregular, fast, slow, or shallow breathing
• Lightheadedness
• Nervousness
• 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
• Sweating
• Swelling of the lower legs or arms
• Tightness in the chest
• Very slow breathing
• Weight gain
• Wheezing

Some side effects 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:

• False or unusual sense of well-being
• Nausea
• Vomiting

• 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
• Sleeplessness
• 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
• Drowsiness
• Dry mouth
• Excitement
• Hearing loss
• Irritability
• Relaxed and calm
• Sleepiness
• Sleeplessness
• Trouble sleeping
• Unable to sleep
• Weakness

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

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