Pentazocine and Acetaminophen (Oral 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 immediately if any of the following side effects occur:

• Back, leg, or stomach pains
• Black, tarry stools
• Bleeding gums
• Blistering, peeling, or loosening of the skin
• Burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
• Chest pain
• Chills
• Cough or hoarseness
• Dark urine
• Decrease in the frequency of urination
• Decrease in urine volume
• Diarrhea
• Difficult or troubled breathing
• Difficulty in passing urine (dribbling)
• Difficulty with swallowing
• Dizziness
• Fast heartbeat
• Fever
• Fever with or without chills
• General body swelling
• General feeling of tiredness or weakness
• Headache
• Hives
• Irregular, fast or slow, or shallow breathing
• Itching
• Joint or muscle pain
• Loss of appetite
• Lower back or side pain
• Nausea or vomiting
• Nosebleeds
• Painful or difficult urination
• Pale or blue lips, fingernails, or skin
• Pale skin
• Puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
• Red skin lesions, often with a purple center
• Red, irritated eyes
• Shakiness in the legs, arms, hands, or feet
• Shortness of breath
• Skin rash
• Sore throat
• Sores, ulcers, or white spots on the lips or in the mouth
• Swelling or puffiness of the face
• Swollen glands
• Tightness in the chest
• Trembling or shaking of the hands or feet
• Unusual bleeding or bruising
• Unusual tiredness or weakness
• Wheezing
• Yellowing of the eyes or skin

• Blood in the urine
• Bloody nose
• Fainting
• Fast, pounding, or irregular heartbeat or pulse
• Feeling of warmth
• Heavier menstrual periods
• Pinpoint red spots on the skin
• Redness of the face, neck, arms, and occasionally, upper chest
• Sweating

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

• Abdominal or stomach pain or tenderness
• Bleeding gums
• Bloody or cloudy urine
• Blurred vision
• Clay-colored stools
• Cold sweats
• Confusion
• Cool, pale skin
• Decreased appetite
• Depression
• Drowsiness
• Fear or nervousness
• Increased hunger
• Muscle tremors
• Nightmares
• Rapid, deep breathing
• Restlessness
• Seeing, hearing, or feeling things that are not there
• Seizures
• Slurred speech
• Stomach cramps
• Strange thoughts
• Sudden decrease in the amount of urine
• Sugar in the urine
• Swelling of the feet or lower legs
• Unpleasant breath odor
• Unusual bleeding or bruising
• Unusual drowsiness, dullness, tiredness, weakness, or feeling of sluggishness
• Vomiting of blood
• Weight loss

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:

• Continuing ringing or buzzing or other unexplained noise in the ears
• Excitement
• Hearing loss
• Hives or welts
• Irritability
• Redness of the skin

• Confusion about identity, place, and time
• Constipation
• Difficulty in focusing the eyes
• Disturbed dreams
• Drowsiness
• False or unusual sense of well-being
• Relaxed and calm feeling
• 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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